[PATCH 3/9] lpfc: Fix list_entry null check warning in lpfc_cmpl_els_plogi

[Justin Tee <justintee8345@gmail.com>]

Smatch called out a warning for null checking a ptr that is assigned by
list_entry.  list_entry does not return null and, if the list is empty,
can return an invalid ptr.  Thus, the !psrp check does not execute
properly.

 drivers/scsi/lpfc/lpfc_els.c:2133 lpfc_cmpl_els_plogi()
 warn: list_entry() does not return NULL 'prsp'

Replace list_entry with list_get_first, which does a list_empty check
before returning the first entry.

Fixes: a3c3c0a806f1 ("scsi: lpfc: Validate ELS LS_ACC completion payload")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-scsi/01b7568f-4ab4-4d56-bfa6-9ecc5fc261fe@moroto.mountain/
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
---
 drivers/scsi/lpfc/lpfc_els.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index f9627eddab08..0829fe6ddff8 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -2128,8 +2128,8 @@ lpfc_cmpl_els_plogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 						NLP_EVT_DEVICE_RM);
 	} else {
 		/* Good status, call state machine */
-		prsp = list_entry(cmdiocb->cmd_dmabuf->list.next,
-				  struct lpfc_dmabuf, list);
+		prsp = list_get_first(&cmdiocb->cmd_dmabuf->list,
+				      struct lpfc_dmabuf, list);
 		if (!prsp)
 			goto out;
 		if (!lpfc_is_els_acc_rsp(prsp))
-- 
2.38.0