Fix compiler warnings libvncclient + gtkvncviewer

Fixes the following compiler warnings.

gtkvncviewer:

==
  CC       gtkvncviewer-gtkvncviewer.o
gtkvncviewer.c: In function ‘GtkDefaultLog’:
gtkvncviewer.c:591:2: warning: format not a string literal and no format arguments [-Wformat-security]
  fprintf (stdout, buf);
  ^
==

libvncclient:

==
  CC       rfbproto.lo
In file included from rfbproto.c:2376:0:
zrle.c: In function 'HandleZRLE8':
zrle.c:201:5: warning: pointer targets in passing argument 2 of 'HandleZRLETile8' differ in signedness [-Wpointer-sign]
     int result=HandleZRLETile(client,buf,remaining,rx+i,ry+j,subWidth,subHeight);
     ^
zrle.c:37:33: note: expected 'uint8_t *' but argument is of type 'char *'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                                 ^
rfbproto.c:2364:22: note: in definition of macro 'CONCAT2'
 #define CONCAT2(a,b) a##b
                      ^
zrle.c:37:24: note: in expansion of macro 'CONCAT2E'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                        ^
zrle.c:79:12: note: in expansion of macro 'HandleZRLETile'
 static int HandleZRLETile(rfbClient* client,
            ^
In file included from rfbproto.c:2385:0:
zrle.c: In function 'HandleZRLE16':
zrle.c:201:5: warning: pointer targets in passing argument 2 of 'HandleZRLETile16' differ in signedness [-Wpointer-sign]
     int result=HandleZRLETile(client,buf,remaining,rx+i,ry+j,subWidth,subHeight);
     ^
zrle.c:37:33: note: expected 'uint8_t *' but argument is of type 'char *'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                                 ^
rfbproto.c:2364:22: note: in definition of macro 'CONCAT2'
 #define CONCAT2(a,b) a##b
                      ^
zrle.c:37:24: note: in expansion of macro 'CONCAT2E'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                        ^
zrle.c:79:12: note: in expansion of macro 'HandleZRLETile'
 static int HandleZRLETile(rfbClient* client,
            ^
In file included from rfbproto.c:2387:0:
zrle.c: In function 'HandleZRLE15':
zrle.c:201:5: warning: pointer targets in passing argument 2 of 'HandleZRLETile15' differ in signedness [-Wpointer-sign]
     int result=HandleZRLETile(client,buf,remaining,rx+i,ry+j,subWidth,subHeight);
     ^
zrle.c:37:33: note: expected 'uint8_t *' but argument is of type 'char *'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                                 ^
rfbproto.c:2364:22: note: in definition of macro 'CONCAT2'
 #define CONCAT2(a,b) a##b
                      ^
zrle.c:37:24: note: in expansion of macro 'CONCAT2E'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                        ^
zrle.c:79:12: note: in expansion of macro 'HandleZRLETile'
 static int HandleZRLETile(rfbClient* client,
            ^
In file included from rfbproto.c:2396:0:
zrle.c: In function 'HandleZRLE32':
zrle.c:201:5: warning: pointer targets in passing argument 2 of 'HandleZRLETile32' differ in signedness [-Wpointer-sign]
     int result=HandleZRLETile(client,buf,remaining,rx+i,ry+j,subWidth,subHeight);
     ^
zrle.c:37:33: note: expected 'uint8_t *' but argument is of type 'char *'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                                 ^
rfbproto.c:2364:22: note: in definition of macro 'CONCAT2'
 #define CONCAT2(a,b) a##b
                      ^
zrle.c:37:24: note: in expansion of macro 'CONCAT2E'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                        ^
zrle.c:79:12: note: in expansion of macro 'HandleZRLETile'
 static int HandleZRLETile(rfbClient* client,
            ^
In file included from rfbproto.c:2398:0:
zrle.c: In function 'HandleZRLE24':
zrle.c:201:5: warning: pointer targets in passing argument 2 of 'HandleZRLETile24' differ in signedness [-Wpointer-sign]
     int result=HandleZRLETile(client,buf,remaining,rx+i,ry+j,subWidth,subHeight);
     ^
zrle.c:37:33: note: expected 'uint8_t *' but argument is of type 'char *'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                                 ^
rfbproto.c:2364:22: note: in definition of macro 'CONCAT2'
 #define CONCAT2(a,b) a##b
                      ^
zrle.c:37:24: note: in expansion of macro 'CONCAT2E'
 #define HandleZRLETile CONCAT2E(HandleZRLETile,REALBPP)
                        ^
zrle.c:79:12: note: in expansion of macro 'HandleZRLETile'
 static int HandleZRLETile(rfbClient* client,
            ^
In file included from rfbproto.c:2401:0:
zrle.c: In function 'HandleZRLE24Down':
zrle.c:201:5: warning: pointer targets in passing argument 2 of 'HandleZRLETile24Down' differ in signedness [-Wpointer-sign]
     int result=HandleZRLETile(client,buf,remaining,rx+i,ry+j,subWidth,subHeight);
     ^
zrle.c:40:33: note: expected 'uint8_t *' but argument is of type 'char *'
 #define HandleZRLETile CONCAT3E(HandleZRLETile,REALBPP,Down)
                                 ^
rfbproto.c:2366:24: note: in definition of macro 'CONCAT3'
 #define CONCAT3(a,b,c) a##b##c
                        ^
zrle.c:40:24: note: in expansion of macro 'CONCAT3E'
 #define HandleZRLETile CONCAT3E(HandleZRLETile,REALBPP,Down)
                        ^
zrle.c:79:12: note: in expansion of macro 'HandleZRLETile'
 static int HandleZRLETile(rfbClient* client,
            ^
In file included from rfbproto.c:2404:0:
zrle.c: In function 'HandleZRLE24Up':
zrle.c:201:5: warning: pointer targets in passing argument 2 of 'HandleZRLETile24Up' differ in signedness [-Wpointer-sign]
     int result=HandleZRLETile(client,buf,remaining,rx+i,ry+j,subWidth,subHeight);
     ^
zrle.c:43:33: note: expected 'uint8_t *' but argument is of type 'char *'
 #define HandleZRLETile CONCAT3E(HandleZRLETile,REALBPP,Up)
                                 ^
rfbproto.c:2366:24: note: in definition of macro 'CONCAT3'
 #define CONCAT3(a,b,c) a##b##c
                        ^
zrle.c:43:24: note: in expansion of macro 'CONCAT3E'
 #define HandleZRLETile CONCAT3E(HandleZRLETile,REALBPP,Up)
                        ^
zrle.c:79:12: note: in expansion of macro 'HandleZRLETile'
 static int HandleZRLETile(rfbClient* client,
            ^
==
Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>

client_examples/gtkvncviewer.c

@@ -588,7 +588,7 @@ static void GtkDefaultLog (const char *format, ...)
 
 	time (&log_clock);
 	strftime (buf, 255, "%d/%m/%Y %X ", localtime (&log_clock));
-	fprintf (stdout, buf);
+	fprintf (stdout, "%s", buf);
 
 	vfprintf (stdout, format, args);
 	fflush (stdout);

libvncclient/zrle.c

@@ -198,7 +198,7 @@ HandleZRLE (rfbClient* client, int rx, int ry, int rw, int rh)
 			for(i=0; i<rw; i+=rfbZRLETileWidth) {
 				int subWidth=(i+rfbZRLETileWidth>rw)?rw-i:rfbZRLETileWidth;
 				int subHeight=(j+rfbZRLETileHeight>rh)?rh-j:rfbZRLETileHeight;
-				int result=HandleZRLETile(client,buf,remaining,rx+i,ry+j,subWidth,subHeight);
+				int result=HandleZRLETile(client,(uint8_t *)buf,remaining,rx+i,ry+j,subWidth,subHeight);
 
 				if(result<0) {
 					rfbClientLog("ZRLE decoding failed (%d)\n",result);