f2fs: adjust kernel coding style

As pointed out by Randy Dunlap, this patch removes all usage of "/**" for comment
blocks. Instead, just use "/*".

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 5ec7a06..089eb67 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -1,4 +1,4 @@
-/**
+/*
  * fs/f2fs/dir.c
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
@@ -453,7 +453,7 @@
 	return err;
 }
 
-/**
+/*
  * It only removes the dentry from the dentry page,corresponding name
  * entry in name page does not need to be touched during deletion.
  */