amr_ccb_alloc
if (amr_ccb_alloc(amr, &ac) != 0)
while (amr_ccb_alloc(amr, &ac) != 0) {
if ((rv = amr_ccb_alloc(amr, &ac)) == 0) {
if ((rv = amr_ccb_alloc(amr, &ac)) != 0) {
int amr_ccb_alloc(struct amr_softc *, struct amr_ccb **);
if ((rv = amr_ccb_alloc(amr, &ac)) != 0)