scsi: lpfc: correct rcu unlock issue in lpfc_nvme_info_show

Many of the exit cases were not releasing the rcu read lock.  Corrected the
exit paths.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Tested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>