usbd_xfer_trycomplete
if (!usbd_xfer_trycomplete(xfer))
if (xfer && usbd_xfer_trycomplete(xfer)) {
if (xfer && usbd_xfer_trycomplete(xfer)) {
if (xfer && usbd_xfer_trycomplete(xfer)) {
if (xfer && usbd_xfer_trycomplete(xfer)) {
if (!usbd_xfer_trycomplete(xfer))
if (!usbd_xfer_trycomplete(xfer))
if (!usbd_xfer_trycomplete(xfer))
bool usbd_xfer_trycomplete(struct usbd_xfer *);
if (!usbd_xfer_trycomplete(xfer))