scsi: lpfc: fix potential buffer overflow.

This patch fixes a potential buffer overflow in lpfc_nvme_info_show().

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Acked-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>