Silence GCC warning

git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@27834 b3059339-0415-0410-9bf9-f77b7e298cf2

swscale.c

@@ -1741,7 +1741,7 @@ static int pal2rgbWrapper(SwsContext *c, uint8_t* src[], int srcStride[], int sr
 
 
     for (i=0; i<srcSliceH; i++) {
-        conv(srcPtr, dstPtr, c->srcW, c->pal_rgb);
+        conv(srcPtr, dstPtr, c->srcW, (uint8_t *) c->pal_rgb);
         srcPtr+= srcStride[0];
         dstPtr+= dstStride[0];
     }