fs/ntfs3: Refactor ntfs_readlink_hlp

mainline inclusion
from mainline-v5.15
commit 4dbe8e44
category: feature
bugzilla:
https://gitee.com/openeuler/kernel/issues/I4G67J?from=project-issue


CVE: NA

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

Rename some variables.
Returned err by default is EINVAL.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Yin Xiujiang <yinxiujiang@kylinos.cn>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Acked-by: Hou Tao <houtao1@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>