5b4f9cf3cc33 ("tty: invert return values of tty_{,un}throttle_safe()")
c2a36609dab3 ("tty: switch tty_{,un}throttle_safe() to return a bool")
043c8a7c01ec ("tty: n_tty: use do-while in n_tty_check_{,un}throttle()")