scsi: isci: Remove redundant initialization of variable 'status'

This patch removes unneeded return variables. It fixes the following
warning detected by coccinelle:

./drivers/scsi/isci/request.c:1483:17-23: Unneeded variable: "status".
Return "SCI_SUCCESS" on line 1503
./drivers/scsi/isci/request.c:2157:17-23: Unneeded variable: "status".
Return "SCI_SUCCESS" on line 2177

Link: https://lore.kernel.org/r/1612424915-106608-1-git-send-email-yang.lee@linux.alibaba.com


Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>