scsi: isci: Remove the unneeded variable "status"

The variable 'status' is being initialized with SCI_SUCCESS and never
updated later with a new value. The initialization is redundant and can be
removed.

Link: https://lore.kernel.org/r/1609311860-102820-1-git-send-email-abaci-bugfix@linux.alibaba.com


Reported-by: Abaci <abaci@linux.alibaba.com>
Signed-off-by: YANG LI <abaci-bugfix@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>