Remove redundant and harmful explicit filename after @file Doxygen command.

Originally committed as revision 23971 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dpcm.c

@@ -20,7 +20,7 @@
  */
 
 /**
- * @file: dpcm.c
+ * @file
  * Assorted DPCM (differential pulse code modulation) audio codecs
  * by Mike Melanson (melanson@pcisys.net)
  * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt)

libavcodec/pictordec.c

@@ -20,7 +20,7 @@
  */
 
 /**
- * @file libavcodec/picdec.c
+ * @file
  * Pictor/PC Paint decoder
  */