/* This function will removes a previously registed usb class driver. */
rt_err_t rt_usb_class_driver_unregister(ucd_t drv)
/* This function will removes a previously registed usb class driver. */
rt_err_t rt_usb_class_driver_unregister(ucd_t drv)
{
    RT_ASSERT(drv != RT_NULL);
    rt_list_remove(&(drv->list));
    return RT_EOK;
}