cosmetics: Add #endif comment.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@10829 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/asfcrypt.h

@@ -24,4 +24,4 @@
 
 void ff_asfcrypt_dec(const uint8_t key[20], uint8_t *data, int len);
 
-#endif
+#endif /* FFMPEG_ASFCRYPT_H */