Since sync_inodes_sb has been used, there is no need to
use writeback_inodes_sb, so remove it.
Signed-off-by: NLiu Song <liu.song11@zte.com.cn>
Reviewed-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>