correct comment about seek function

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8797 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/mxf.c

@@ -991,7 +991,7 @@ static int mxf_probe(AVProbeData *p) {
     return 0;
 }
 
-/* rudimentary binary seek */
+/* rudimentary byte seek */
 /* XXX: use MXF Index */
 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
 {