tty_makedevf
error = tty_makedevf(tp, cred, endc == 'A' ? TTYMK_CLONING : 0,
error = tty_makedevf(tp, cred, endc == 'B' ? TTYMK_CLONING : 0,
int tty_makedevf(struct tty *tp, struct ucred *cred, int flags,
(void )tty_makedevf((tp), (cred), 0, (fmt), ## __VA_ARGS__)