scsi: qla2xxx: Fix inconsistent format argument type in qla_dbg.c

scsi: qla2xxx: Fix inconsistent format argument type in qla_dbg.c

Fix the following warning:

[drivers/scsi/qla2xxx/qla_dbg.c:2451]: (warning) %ld in format string (no. 4)
	requires 'long' but the argument type is 'unsigned long'.

Link: https://lore.kernel.org/r/20200930022515.2862532-4-yebin10@huawei.com
Reported-by: Hulk Robot <hulkci@huawei.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Ye Bin <yebin10@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>