Fix a mem leak in vc1_decode_frame().

Patch by Erik Hovland erik hovland org

Originally committed as revision 14277 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vc1.c

@@ -4005,6 +4005,7 @@ static int vc1_decode_frame(AVCodecContext *avctx,
             divider = find_next_marker(buf, buf + buf_size);
             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){
                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");
+                av_free(buf2);
                 return -1;
             }