RUN_N_XFER
for (i = 0; i != RUN_N_XFER; i++)
for(i = 0; i < RUN_N_XFER; i++)
static const struct usb_config run_config[RUN_N_XFER] = {
sc->sc_xfer, run_config, RUN_N_XFER, sc, &sc->sc_mtx);
usbd_transfer_unsetup(sc->sc_xfer, RUN_N_XFER);
struct usb_xfer *sc_xfer[RUN_N_XFER];