[ Upstream commit f84262b0862d43b71b3e80a036cdd9d82e620367 ]

If we have an error in f2fs_build_free_nids, we're able to fall into a loop
to find free nids.
Suggested-by: NChao Yu <chao@kernel.org>
Reviewed-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>