qcacld-3.0: Fix assert in sme_store_nss_chains_cfg

Need check whether vdev is NULL when pass to
sme_store_nss_chains_cfg.

Change-Id: I1bfa62c8a898ad28e7771e27583e5775d515924a
CRs-Fixed: 2597475

core/hdd/src/wlan_hdd_main.c

@@ -4591,7 +4591,11 @@ hdd_store_nss_chains_cfg_in_vdev(struct hdd_adapter *adapter)
 				      hdd_ctx->num_rf_chains);
 
 	/* Store the nss chain config into the vdev */
-	sme_store_nss_chains_cfg_in_vdev(adapter->vdev, &vdev_ini_cfg);
+	if (adapter->vdev)
+		sme_store_nss_chains_cfg_in_vdev(adapter->vdev, &vdev_ini_cfg);
+	else
+		hdd_err("Vdev is NULL");
+
 }
 
 bool hdd_is_vdev_in_conn_state(struct hdd_adapter *adapter)