gnttab_end_foreign_access_ref
gnttab_end_foreign_access_ref(sc->xbd_ring_ref[i]);
if (gnttab_end_foreign_access_ref(gref->gref_id)
if (gnttab_end_foreign_access_ref(ref)) {
if (gnttab_end_foreign_access_ref(*refs)) {
gnttab_end_foreign_access_ref(txq->grant_ref[i]);
gnttab_end_foreign_access_ref(ref);
gnttab_end_foreign_access_ref(txq->grant_ref[id]);
ret = gnttab_end_foreign_access_ref(ref);
int gnttab_end_foreign_access_ref(grant_ref_t ref);