GN_CARTBOOST should end when turning cart off

/*==========================================
* ƒJ?ƒgÝ’è
*------------------------------------------*/
int pc_setcart(struct map_session_data *sd,int type) {
#ifndef NEW_CARTS
int cart[6] = {0x0000,OPTION_CART1,OPTION_CART2,OPTION_CART3,OPTION_CART4,OPTION_CART5};
int option;
#endif
nullpo_ret(sd);
if( type < 0 || type > MAX_CARTS )
  return 1;// Never trust the values sent by the client! [Skotlex]
if( pc_checkskill(sd,MC_PUSHCART) <= 0 )
  return 1;// Push cart is required
 
if( type == 0 && pc_iscarton(sd) )
   status_change_end(&sd->bl,SC_GN_CARTBOOST,INVALID_TIMER);
#ifdef NEW_CARTS

switch( type ) {
  case 0:
   if( !sd->sc.data[SC_PUSH_CART] )
    return 0;
   status_change_end(&sd->bl,SC_PUSH_CART,INVALID_TIMER);
   clif_clearcart(sd->fd);
   break;
  default:/* everything else is an allowed ID so we can move on */
   if( !sd->sc.data[SC_PUSH_CART] ) /* first time, so fill cart data */
    clif_cartlist(sd);
   clif_updatestatus(sd, SP_CARTINFO);
   sc_start(&sd->bl, SC_PUSH_CART, 100, type, 0);
   clif_status_load_notick(&sd->bl, SI_ON_PUSH_CART,   2 , type, 0, 0);
   break;
}

if(pc_checkskill(sd, MC_PUSHCART) < 10)
  status_calc_pc(sd,0); //Recalc speed penalty.
#else
// Update option
option = sd->sc.option;
option &= ~OPTION_CART;// clear cart bits
option |= cart[type]; // set cart
pc_setoption(sd, option);
#endif

return 0;
}