xfs: abort xattr scrub if fatal signals are pending

mainline inclusion
from mainline-v5.1-rc1
commit 3258cb20
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5BDCU


CVE: NA

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

The extended attribute scrubber should abort the "read all attrs" loop
if there's a fatal signal pending on the process.

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>