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
diff --git a/libavcodec/msmpeg4.c b/libavcodec/msmpeg4.c
index 94127cf..84658fe 100644
--- a/libavcodec/msmpeg4.c
+++ b/libavcodec/msmpeg4.c
@@ -23,7 +23,7 @@
  */
 
 /**
- * @file libavcodec/msmpeg4.c
+ * @file
  * MSMPEG4 backend for ffmpeg encoder and decoder.
  */