Fix two issues in rfbGetClient()

There was an unnecessary assignment, and an assignment of a string that
was to be free()ed later, so it has to be strdup()ed.

Both issues spotted by Roman Held.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

libvncclient/vncviewer.c

@@ -111,10 +111,9 @@ rfbClient* rfbGetClient(int bitsPerSample,int samplesPerPixel,
     return NULL;
   }
   initAppData(&client->appData);
-  client->programName = NULL;
   client->endianTest = 1;
   client->programName="";
-  client->serverHost="";
+  client->serverHost=strdup("");
   client->serverPort=5900;
   
   client->CurrentKeyboardLedState = 0;
@@ -265,6 +264,9 @@ rfbBool rfbInitClient(rfbClient* client,int* argc,char** argv) {
       } else {
 	char* colon=strchr(argv[i],':');
 
+	if(client->serverHost)
+	  free(client->serverHost);
+
 	if(colon) {
 	  client->serverHost=strdup(argv[i]);
 	  client->serverHost[(int)(colon-argv[i])]='\0';