Fix regression in Ultra encoding introduced by commit fe1ca16e.

My bad. There we see what the encodings test is good for ;-)

libvncclient/ultra.c

@@ -57,7 +57,7 @@ HandleUltraBPP (rfbClient* client, int rx, int ry, int rw, int rh)
    * buffer, this buffer allocation should only happen once, on the
    * first update.
    */
-  if ( client->raw_buffer_size < uncompressedBytes) {
+  if ( client->raw_buffer_size < (int)uncompressedBytes) {
     if ( client->raw_buffer != NULL ) {
       free( client->raw_buffer );
     }
@@ -141,7 +141,7 @@ HandleUltraZipBPP (rfbClient* client, int rx, int ry, int rw, int rh)
    * buffer, this buffer allocation should only happen once, on the
    * first update.
    */
-  if ( client->raw_buffer_size < (uncompressedBytes + 500)) {
+  if ( client->raw_buffer_size < (int)(uncompressedBytes + 500)) {
     if ( client->raw_buffer != NULL ) {
       free( client->raw_buffer );
     }

libvncserver/ultra.c

@@ -68,7 +68,7 @@ rfbSendOneRectEncodingUltra(rfbClientPtr cl,
      */
     maxCompSize = (maxRawSize + maxRawSize / 16 + 64 + 3);
 
-    if (cl->afterEncBufSize < maxCompSize) {
+    if (cl->afterEncBufSize < (int)maxCompSize) {
 	cl->afterEncBufSize = maxCompSize;
 	if (cl->afterEncBuf == NULL)
 	    cl->afterEncBuf = (char *)malloc(cl->afterEncBufSize);