qcacld-3.0: Add null check for mlo sta context

Currently mlo sta context is accessed without null
check in mlo api's.

Add null check for mlo sta context in mlo_check_if_all_links_up
and mlo_check_if_all_vdev_up api's.

CRs-Fixed: 3601823
Change-Id: Iea3f1daf1d9aef40efdff21a02e8a3c23494bfad

components/umac/mlme/mlo_mgr/src/wlan_mlo_mgr_roam.c

@@ -808,6 +808,11 @@ mlo_check_if_all_links_up(struct wlan_objmgr_vdev *vdev)
 	}
 
 	mlo_dev_ctx = vdev->mlo_dev_ctx;
+	if (!mlo_dev_ctx->sta_ctx) {
+		mlo_err("mlo sta ctx is null");
+		return false;
+	}
+
 	sta_ctx = mlo_dev_ctx->sta_ctx;
 	for (i = 0; i < WLAN_UMAC_MLO_MAX_VDEVS; i++) {
 		if (!mlo_dev_ctx->wlan_vdev_list[i])
@@ -848,6 +853,10 @@ mlo_check_if_all_vdev_up(struct wlan_objmgr_vdev *vdev)
 	}
 
 	mlo_dev_ctx = vdev->mlo_dev_ctx;
+	if (!mlo_dev_ctx->sta_ctx) {
+		mlo_err("mlo sta ctx is null");
+		return false;
+	}
 	sta_ctx = mlo_dev_ctx->sta_ctx;
 	for (i = 0; i < WLAN_UMAC_MLO_MAX_VDEVS; i++) {
 		if (!mlo_dev_ctx->wlan_vdev_list[i])