scsi: smartpqi: Change sysfs raid_level attribute to N/A for controllers

Change the sysfs raid_level attribute from "RAID-0" to N/A.
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowan <mike.mcgowan@microchip.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Link: https://lore.kernel.org/r/166793531357.322537.8639138137605612362.stgit@brunhildaSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/smartpqi/smartpqi_init.c

@@ -7255,7 +7255,7 @@ static ssize_t pqi_raid_level_show(struct device *dev,
 		return -ENODEV;
 	}
 
-	if (pqi_is_logical_device(device))
+	if (pqi_is_logical_device(device) && device->devtype == TYPE_DISK)
 		raid_level = pqi_raid_level_to_string(device->raid_level);
 	else
 		raid_level = "N/A";