scsi: qla2xxx: Assign boolean values to a bool variable

Fix the following coccicheck warnings:

./drivers/scsi/qla2xxx/qla_isr.c:780:2-18: WARNING: Assignment
of 0/1 to bool variable.

Link: https://lore.kernel.org/r/1611127919-56551-1-git-send-email-abaci-bugfix@linux.alibaba.com
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Zhong <abaci-bugfix@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>