ufs: scsi: fix redzone overwritten error when print utp hci testbus

When print UTP HCI testbus data, a redzone overwritten error is triggered
because the max select minor value goes across its border. This change
fixes it.

Change-Id: Ib085288f3770aa0ab3683926247fb95f5e50cb08
Signed-off-by: Can Guo <cang@codeaurora.org>