xhci_ring_alloc
if ((ret = xhci_ring_alloc(xhcip, &xcr->xcr_ring)) != 0)
if ((ret = xhci_ring_alloc(xhcip, &xep->xep_ring)) != 0) {
if ((ret = xhci_ring_alloc(xhcip, &xev->xev_ring)) != 0) {
extern int xhci_ring_alloc(xhci_t *, xhci_ring_t *);