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/roqvideodec.c

@@ -19,7 +19,7 @@
  */
 
 /**
- * @file libavcodec/roqvideodec.c
+ * @file
  * id RoQ Video Decoder by Dr. Tim Ferguson
  * For more information about the id RoQ format, visit:
  *   http://www.csse.monash.edu.au/~timf/