Remove explicit filename from Doxygen @file commands.

Passing an explicit filename to this command is only necessary if the
documentation in the @file block refers to a file different from the
one the block resides in.

Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/yop.c

@@ -1,5 +1,5 @@
 /**
- * @file libavcodec/yop.c
+ * @file
  * Psygnosis YOP decoder
  *
  * Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com>