always close pull audio device when we're doing with it

app/audio/outputdeviceproxy.cpp

@@ -18,6 +18,13 @@ void AudioOutputDeviceProxy::SetSendAverages(bool send)
   send_averages_ = send;
 }
 
+void AudioOutputDeviceProxy::close()
+{
+  QIODevice::close();
+
+  device_->close();
+}
+
 qint64 AudioOutputDeviceProxy::readData(char *data, qint64 maxlen)
 {
   if (device_) {

app/audio/outputdeviceproxy.h

@@ -13,6 +13,8 @@ public:
 
   void SetSendAverages(bool send);
 
+  virtual void close() override;
+
 signals:
   void ProcessedAverages(QVector<double> averages);