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Fix the following warning:

[drivers/scsi/qla4xxx/ql4_nx.c:3228]: (warning) %ld in format string (no. 1)
	requires 'long' but the argument type is 'unsigned long'.

Link: https://lore.kernel.org/r/20200930022228.2840587-1-yebin10@huawei.com

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Ye Bin <yebin10@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>