URAL_N_TRANSFER
static const struct usb_config ural_config[URAL_N_TRANSFER] = {
URAL_N_TRANSFER, sc, &sc->sc_mtx);
usbd_transfer_unsetup(sc->sc_xfer, URAL_N_TRANSFER);
struct usb_xfer *sc_xfer[URAL_N_TRANSFER];