(svn r8896) -Fix

Most (i.e. 13 of 15) callers of GetNewVehiclePos() do not care for the return and the others can figure it out by inspecting the information returned in struct GetNewVehiclePosResult.
Therefore remove the return value.

src/ship_cmd.cpp

@@ -692,7 +692,8 @@ static void ShipController(Vehicle *v)
 
 	BeginVehicleMove(v);
 
-	if (GetNewVehiclePos(v, &gp)) {
+	GetNewVehiclePos(v, &gp);
+	if (gp.old_tile == gp.new_tile) {
 		/* Staying in tile */
 		if (IsShipInDepot(v)) {
 			gp.x = v->x_pos;