scsi: megaraid_mbox: Use DEVICE_ATTR_ADMIN_RO() macro
Use DEVICE_ATTR_ADMIN_RO() macro helper instead of plain DEVICE_ATTR(), which makes the code a bit shorter and easier to read. Link: https://lore.kernel.org/r/20210616034419.725-4-thunder.leizhen@huawei.com Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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