Fixes:

xvmcvideo.c: In function ‘XVMC_decode_mb’:
xvmcvideo.c:141: warning: ‘return’ with a value, in function returning void

Approved by Ivan.

Originally committed as revision 6676 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/xvmcvideo.c

@@ -138,7 +138,7 @@ const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 
     if(s->encoding){
         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
-        return -1;
+        return;
     }
 
    //from MPV_decode_mb(),