scsi: lpfc: Drop nodelist reference on error in lpfc_gen_req()

If we fail to issue the iocb in lpfc_gen_req() we need to drop the nodelist
reference.

Link: https://lore.kernel.org/r/20200910084059.138507-1-hare@suse.de


Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>