scsi: target: tcmu: Add missing newline when printing parameters

The tcmu 'global_max_data_area_mb' parameter in sysfs is missing a
newline. Add it.

Link: https://lore.kernel.org/r/1599132573-33818-1-git-send-email-wangxiongfeng2@huawei.com


Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>