- slave_event_callback_add(info->slave, SLAVE_EVENT_DEACTIVATE, slave_deactivated_cb, info);
- slave_event_callback_add(info->slave, SLAVE_EVENT_ACTIVATE, slave_activated_cb, info);
- slave_event_callback_add(info->slave, SLAVE_EVENT_FAULT, slave_fault_cb, info);
+ (void)slave_event_callback_add(info->slave, SLAVE_EVENT_DEACTIVATE, slave_deactivated_cb, info);
+ (void)slave_event_callback_add(info->slave, SLAVE_EVENT_ACTIVATE, slave_activated_cb, info);
+ (void)slave_event_callback_add(info->slave, SLAVE_EVENT_FAULT, slave_fault_cb, info);