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/xattr.h b/fs/f2fs/xattr.h
index 29b0a08..49c9558 100644
--- a/fs/f2fs/xattr.h
+++ b/fs/f2fs/xattr.h
@@ -1,4 +1,4 @@
-/**
+/*
  * fs/f2fs/xattr.h
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
@@ -77,7 +77,7 @@
 #define MAX_VALUE_LEN	(MIN_OFFSET - sizeof(struct f2fs_xattr_header) - \
 			sizeof(struct f2fs_xattr_entry))
 
-/**
+/*
  * On-disk structure of f2fs_xattr
  * We use only 1 block for xattr.
  *