Bluetooth: Mesh: Fix dead code issue when getting node id state

Refactor the function to avoid dead code.

Coverity-CID: 321153
Fixes #59527

Signed-off-by: Pavel Vasilyev <pavel.vasilyev@nordicsemi.no>

subsys/bluetooth/mesh/subnet.c

@@ -695,15 +695,13 @@ uint8_t bt_mesh_subnet_priv_node_id_get(uint16_t net_idx,
 enum bt_mesh_subnets_node_id_state bt_mesh_subnets_node_id_state_get(void)
 {
 	for (int i = 0; i < ARRAY_SIZE(subnets); i++) {
-		bool priv_node_id = false;
-
+		if (subnets[i].node_id) {
 #if CONFIG_BT_MESH_PRIV_BEACONS
-		priv_node_id = subnets[i].priv_beacon_ctx.node_id;
+			if (subnets[i].priv_beacon_ctx.node_id) {
+				return BT_MESH_SUBNETS_NODE_ID_STATE_ENABLED_PRIVATE;
+			}
 #endif
-
-		if (subnets[i].node_id || priv_node_id) {
-			return priv_node_id ? BT_MESH_SUBNETS_NODE_ID_STATE_ENABLED_PRIVATE :
-					      BT_MESH_SUBNETS_NODE_ID_STATE_ENABLED;
+			return BT_MESH_SUBNETS_NODE_ID_STATE_ENABLED;
 		}
 	}