scsi: mvumi: Use true and false for bool variable

Fix the following coccicheck warnings:

./drivers/scsi/mvumi.c:69:9-10: WARNING: return of 0/1 in function
'tag_is_empty' with return type bool.

Link: https://lore.kernel.org/r/1613643371-122635-1-git-send-email-jiapeng.chong@linux.alibaba.com


Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>