matroskadec: unset matroska->done when seeking
just in case someone try to seek back after reaching the end of file
Originally committed as revision 14960 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 68d3aa3..19dde9d 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1670,6 +1670,7 @@
url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
matroska->skip_to_stream = st;
+ matroska->done = 0;
av_update_cur_dts(s, st, st->index_entries[index].timestamp);
return 0;
}