scsi: hisi_sas: Move slot variable definition in hisi_sas_abort_task()

mainline inclusion
from mainline-v6.2-rc1
commit 4b329abc
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6NPLN
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4b329abc91800d23941ac773e69b322a13981ecb



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Each branch currently defines a slot variable independently, and it is
neater to move it to the function head.

Signed-off-by: Xingui Yang <yangxingui@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1665998435-199946-3-git-send-email-john.garry@huawei.com


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: xiabing <xiabing12@h-partners.com>