Revert "NFS: Use of mapping_set_error() results in spurious errors"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5KK4D


CVE: NA

--------------------------------

This reverts commit f4f11702.

7f3945b4aab5 (NFS: Use of mapping_set_error() results in spurious errors)
delete mappint->flags because of 67dd23f9 (nfs: ensure correct writeback
errors are returned on close()). However 67dd23f9 has been reverted, use
mappint->flags to return error.

Signed-off-by: Luo Meng <luomeng12@huawei.com>
Reviewed-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>