Fixed some compiler warnings

examples/Audio/MPEDemo.h

@@ -877,7 +877,7 @@ public:
           visualiserComp (colourPicker)
     {
        #ifndef JUCE_DEMO_RUNNER
-        audioDeviceManager.initialise (0, 2, 0, true, {}, 0);
+        audioDeviceManager.initialise (0, 2, nullptr, true, {}, nullptr);
        #endif
 
         audioDeviceManager.addMidiInputDeviceCallback ({}, this);

examples/Plugins/SurroundPluginDemo.h

@@ -78,8 +78,6 @@ public:
         startTimer (500);
     }
 
-    ~SurroundEditor() {}
-
     void resized() override
     {
         auto r = getLocalBounds();
@@ -222,8 +220,6 @@ public:
                                           .withOutput ("Output", AudioChannelSet::stereo()))
     {}
 
-    ~SurroundProcessor() {}
-
     //==============================================================================
     void prepareToPlay (double sampleRate, int samplesPerBlock) override
     {

examples/Utilities/AnalyticsCollectionDemo.h

@@ -89,7 +89,7 @@ public:
         startAnalyticsThread (initialPeriodMs);
     }
 
-    ~GoogleAnalyticsDestination()
+    ~GoogleAnalyticsDestination() override
     {
         // Here we sleep so that our background thread has a chance to send the
         // last lot of batched events. Be careful - if your app takes too long to
@@ -332,7 +332,7 @@ public:
         logEventButtonPress.reset (new ButtonTracker (eventButton, "button_press", logButtonPressParameters));
     }
 
-    ~AnalyticsCollectionDemo()
+    ~AnalyticsCollectionDemo() override
     {
         // The event type here should probably be DemoAnalyticsEventTypes::sessionEnd
         // in a more advanced app.