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/gc.h b/fs/f2fs/gc.h
index cf42a55..b026d93 100644
--- a/fs/f2fs/gc.h
+++ b/fs/f2fs/gc.h
@@ -1,4 +1,4 @@
-/**
+/*
  * fs/f2fs/gc.h
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
@@ -42,7 +42,7 @@
 	struct inode *inode;
 };
 
-/**
+/*
  * inline functions
  */
 static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)