These helpers returned int but in practice only ever produced 0/1. session_get_idle_hint() silently swallowed negative returns from get_tty_atime()/get_process_ctty_atime() and fell through to return false; user_get_idle_hint() and seat_get_idle_hint() propagated errors from session_get_idle_hint() that could no longer occur. Change all three to return bool and always set *t on non-NULL output. session_get_idle_hint() previously did not set *t on the !SESSION_CLASS_CAN_IDLE() early return; fix by defaulting *t at the top of the function. Callers that read *t after a false return now see DUAL_TIMESTAMP_NULL rather than uninitialized memory. Update all callers: drop dead < 0 error checks, drop > 0 coercion, drop DUAL_TIMESTAMP_NULL pre-init at sites that only pass &t to the helpers.
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