lpfc: Fix possible NULL pointer dereference

Check for the existence of piocb->vport before accessing it.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/lpfc/lpfc_sli.c

@@ -1323,21 +1323,18 @@ lpfc_sli_ringtxcmpl_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
 {
 	lockdep_assert_held(&phba->hbalock);
 
+	BUG_ON(!piocb || !piocb->vport);
+
 	list_add_tail(&piocb->list, &pring->txcmplq);
 	piocb->iocb_flag |= LPFC_IO_ON_TXCMPLQ;
 
 	if ((unlikely(pring->ringno == LPFC_ELS_RING)) &&
 	   (piocb->iocb.ulpCommand != CMD_ABORT_XRI_CN) &&
 	   (piocb->iocb.ulpCommand != CMD_CLOSE_XRI_CN) &&
-	 (!(piocb->vport->load_flag & FC_UNLOADING))) {
-		if (!piocb->vport)
-			BUG();
-		else
+	    (!(piocb->vport->load_flag & FC_UNLOADING)))
 		mod_timer(&piocb->vport->els_tmofunc,
 			  jiffies +
 			  msecs_to_jiffies(1000 * (phba->fc_ratov << 1)));
-	}
-
 
 	return 0;
 }