(svn r6356) -Fix: FS#263 planes come out of hangar and drive back into hangar

Now all vehicles are serviced when it's time for service and they are in a depot
   This will avoid the goto depot order from ever showing up when in a depot

roadveh_cmd.c

@@ -1640,6 +1640,11 @@ static void CheckIfRoadVehNeedsService(Vehicle *v)
 	// If we already got a slot at a stop, use that FIRST, and go to a depot later
 	if (v->u.road.slot != NULL) return;
 
+	if (IsRoadVehInDepot(v)) {
+		VehicleServiceInDepot(v);
+		return;
+	}
+
 	// XXX If we already have a depot order, WHY do we search over and over?
 	depot = FindClosestRoadDepot(v);