Function alarm_pool_cancel_alarm 

pub unsafe extern "C" fn alarm_pool_cancel_alarm(
    pool: *mut alarm_pool_t,
    alarm_id: alarm_id_t,
) -> bool

\brief Cancel an alarm \ingroup alarm \param pool the alarm_pool containing the alarm \param alarm_id the alarm \return true if the alarm was cancelled, false if it didn’t exist \sa alarm_id_t for a note on reuse of IDs