100l, since we already check for buf_size == 769 we should also

handle buf_size < 769 instead of just crashing in smacker decoder.

Originally committed as revision 11822 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/smacker.c

@@ -355,7 +355,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const
     int i;
     int stride;
 
-    if(buf_size == 769)
+    if(buf_size <= 769)
         return 0;
     if(smk->pic.data[0])
             avctx->release_buffer(avctx, &smk->pic);