Method clear_data

src/msg/Message.h:417–422

  virtual void clear_buffers() {}
  void clear_data() {
    if (byte_throttler)
      byte_throttler->put(data.length());
    data.clear();
    clear_buffers(); // let subclass drop buffers as well
  }
  void release_message_throttle() {
    if (msg_throttler)
      msg_throttler->put();