Fix Swap16IfLE() on bytes

When swapping the values for the colour table to little-endian (because
they are 16-bit values), we need to cast "unsigned char" to "unsigned
short"; otherwise, Microsoft's compiler would keep complaining.

Noticed by Christian Ehrlicher.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

libvncserver/rfbserver.c

@@ -3093,9 +3093,9 @@ rfbSendSetColourMapEntries(rfbClientPtr cl,
 	  rgb[i*3+1] = Swap16IfLE(cm->data.shorts[i*3+1]);
 	  rgb[i*3+2] = Swap16IfLE(cm->data.shorts[i*3+2]);
 	} else {
-	  rgb[i*3] = Swap16IfLE(cm->data.bytes[i*3]);
-	  rgb[i*3+1] = Swap16IfLE(cm->data.bytes[i*3+1]);
-	  rgb[i*3+2] = Swap16IfLE(cm->data.bytes[i*3+2]);
+	  rgb[i*3] = Swap16IfLE((unsigned short)cm->data.bytes[i*3]);
+	  rgb[i*3+1] = Swap16IfLE((unsigned short)cm->data.bytes[i*3+1]);
+	  rgb[i*3+2] = Swap16IfLE((unsigned short)cm->data.bytes[i*3+2]);
 	}
       }
     }