usbd_req_get_string_desc
err = usbd_req_get_string_desc(udev, NULL,
if (usbd_req_get_string_desc(f->udev, NULL, ptr,
err = usbd_req_get_string_desc
usb_error_t usbd_req_get_string_desc(struct usb_device *udev, struct mtx *mtx,