static void respond_string(const char *p, size_t len, struct tty_port *port)
{
	tty_insert_flip_string(port, p, len);
	tty_schedule_flip(port);
}
static void respond_string(const char *p, size_t len, struct tty_port *port)
{
	tty_insert_flip_string(port, p, len);
	tty_schedule_flip(port);
}