Method have_hardware_data

DSView/pv/sigsession.cpp:336–344

    }

    bool SigSession::have_hardware_data()
    {
        if (_device_agent.have_instance() && _device_agent.is_hardware())
        {
            Snapshot *data = get_signal_snapshot();
            return data->have_data();
        }
        return false;
    }

    struct ds_device_base_info *SigSession::get_device_list(int &out_count, int &actived_index)
    {