scsi: lpfc: Fix a recently introduced compiler warning

This patch avoids that the following compiler warning is reported with
CONFIG_NVME_FC=n:

drivers/scsi/lpfc/lpfc_nvme.c:2140:1: warning: 'lpfc_nvme_lport_unreg_wait' defined but not used [-Wunused-function]
 lpfc_nvme_lport_unreg_wait(struct lpfc_vport *vport,
 ^~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: 3999df75

 ("scsi: lpfc: Declare local functions static")
Cc: James Smart <james.smart@broadcom.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>