xfs: check attribute name validity

mainline inclusion
from mainline-v5.1-rc1
commit 65480536
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5BDCU


CVE: NA

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Check extended attribute entry names for invalid characters.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

Signed-off-by: tangbin <tangbin@cmss.chinamobile.com>
Reviewed-by: Lihong Kou <koulihong@huawei.com>
Reviewed-by: Xuenan Guo <guoxuenan@huawei.com>
Signed-off-by: Laibin Qiu <qiulaibin@huawei.com>