scsi: qla4xxx: Remove unneeded variable

Remove unneeded variable used to store return value.

Link: https://lore.kernel.org/r/20220224090735.1967816-1-deng.changcheng@zte.com.cn
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>