f2fs: declare load_free_nid_bitmap static

Signed-off-by: NHou Pengyang <houpengyang@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/node.c

@@ -2552,7 +2552,7 @@ static int __get_nat_bitmaps(struct f2fs_sb_info *sbi)
 	return 0;
 }
 
-inline void load_free_nid_bitmap(struct f2fs_sb_info *sbi)
+static inline void load_free_nid_bitmap(struct f2fs_sb_info *sbi)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	unsigned int i = 0;