Remove wrappers of pcm_read_seek().

Last commit missed one file.

Originally committed as revision 13681 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mmf.c

@@ -295,12 +295,6 @@ static int mmf_read_close(AVFormatContext *s)
     return 0;
 }
 
-static int mmf_read_seek(AVFormatContext *s,
-                         int stream_index, int64_t timestamp, int flags)
-{
-    return pcm_read_seek(s, stream_index, timestamp, flags);
-}
-
 #ifdef CONFIG_MMF_DEMUXER
 AVInputFormat mmf_demuxer = {
     "mmf",
@@ -310,7 +304,7 @@ AVInputFormat mmf_demuxer = {
     mmf_read_header,
     mmf_read_packet,
     mmf_read_close,
-    mmf_read_seek,
+    pcm_read_seek,
 };
 #endif
 #ifdef CONFIG_MMF_MUXER