usbd_transfer_pending
if (usbd_transfer_pending(xfer)) {
if (usbd_transfer_pending(xfer)) {
if (usbd_transfer_pending(xfer)) {
error = usbd_transfer_pending(f->fs_xfer[u.pstall->ep_index]);
while (usbd_transfer_pending(sc->xfer[sc->state])) {
while (usbd_transfer_pending(sc->xfer[0]))
while (usbd_transfer_pending(xfer)) {
while (usbd_transfer_pending(xfer) ||
uint8_t usbd_transfer_pending(struct usb_xfer *xfer);