[PATCH] wifi: iwlwifi: pcie: add NULL check for trans->dbg.dest_tlv in dump_monitor

[sunliming]

From: sunliming <sunliming@xxxxxxxxxx>

Fix below smatch warnings:
drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/trans.c:3527 iwl_trans_pcie_dump_monitor()
error: we previously assumed 'trans->dbg.dest_tlv' could be null

Fixes: c8a00a6e89ff ("wifi: iwlwifi: pcie: move generation specific
files to a folder")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <error27@xxxxxxxxx>
Signed-off-by: sunliming <sunliming@xxxxxxxxxx>
---
 drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/trans.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/trans.c
index 28b276c65952..9cea0fe9e578 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/trans.c
@@ -3516,7 +3516,8 @@ iwl_trans_pcie_dump_monitor(struct iwl_trans *trans,
 
 			iwl_trans_pcie_read_mem(trans, base, fw_mon_data->data,
 						monitor_len / sizeof(u32));
-		} else if (trans->dbg.dest_tlv->monitor_mode == MARBH_MODE) {
+		} else if (trans->dbg.dest_tlv &&
+				(trans->dbg.dest_tlv->monitor_mode == MARBH_MODE)) {
 			monitor_len =
 				iwl_trans_pci_dump_marbh_monitor(trans,
 								 fw_mon_data,
-- 
2.43.0