usba_do_req_exc_cb
usba_do_req_exc_cb(req_wrp, USB_CR_FLUSHED,
usba_do_req_exc_cb(req_wrp, cr, cb_flags);
usba_do_req_exc_cb(wrp,
usba_do_req_exc_cb(wrp, USB_CR_PIPE_CLOSING, 0);
usba_do_req_exc_cb(wrp, USB_CR_FLUSHED, 0);
void usba_do_req_exc_cb(usba_req_wrapper_t *, usb_cr_t,