Merge "btaa: null check btaa instance when receiving callback from SystemSuspend"

    bool success, const std::vector<std::string>& wakeupReasons) {}

Status WakelockCallback::notifyAcquired(void) {

  if (instance) {

    instance->onWakelockAcquired();

  }

  return Status::ok();

}

Status WakelockCallback::notifyReleased(void) {

  if (instance) {

    instance->onWakelockReleased();

  }

  return Status::ok();

}

Status WakeupCallback::notifyWakeup(

    bool success, const std::vector<std::string>& wakeupReasons) {

  if (instance) {

    instance->onWakeup(success, wakeupReasons);

  }

  return Status::ok();

}