Remove nonsensical assignment from asf_read_seek() found by CSA.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18565 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/asfdec.c

@@ -1045,7 +1045,6 @@ static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int
 
         /* find the position */
         pos = st->index_entries[index].pos;
-        pts = st->index_entries[index].timestamp;
 
     // various attempts to find key frame have failed so far
     //    asf_reset_header(s);