minor cleanup for PR review

mycroft/audio/audioservice.py

@@ -304,36 +304,37 @@ class AudioService:
             Args:
                 message: message bus message, not used but required
         """
-        def __restore_volume():
+        def restore_volume():
             LOG.debug('restoring volume')
             self.current.restore_volume()
 
-        def wait_for_speak(bus, timeout=8):
+        def wait_for_speak(timeout=8):
             """Wait for a speak Message on the bus.
 
             Arguments:
                 bus (Mycroft MessageBus): Bus instance to listen on
                 timeout (int): how long to wait, defaults to 8 sec
             """
-            self.speak_msg_detected = False
+            speak_msg_detected = False
 
             def detected_speak(message=None):
-                self.speak_msg_detected = True
+                nonlocal speak_msg_detected
+                speak_msg_detected = True
             self.bus.on('speak', detected_speak)
             time.sleep(timeout)
             self.bus.remove('speak', detected_speak)
-            return self.speak_msg_detected
+            return speak_msg_detected
 
-        if self.current is None:
+        if self.current:
+            self.bus.on('recognizer_loop:speech.recognition.unknown',
+                        restore_volume)
+            speak_msg_detected = wait_for_speak(self.bus)
+            if not speak_msg_detected:
+                restore_volume()
+            self.bus.remove('recognizer_loop:speech.recognition.unknown',
+                            restore_volume)
+        else:
             LOG.debug("No audio service to restore volume of")
-            return None
-        self.bus.on('recognizer_loop:speech.recognition.unknown',
-                    __restore_volume)
-        speak_msg_detected = wait_for_speak(self.bus)
-        if not speak_msg_detected:
-            __restore_volume()
-        self.bus.remove('recognizer_loop:speech.recognition.unknown',
-                        __restore_volume)
 
     def play(self, tracks, prefered_service, repeat=False):
         """