More 'nullptr' updates and minor clean-ups.

src/native/linux/juce_linux_Audio.cpp

@@ -366,7 +366,7 @@ private:
             default:    jassertfalse; break; // unsupported format!
         }
 
-        return 0;
+        return nullptr;
     }
 
     //==============================================================================
@@ -973,7 +973,7 @@ public:
                                           inputIds [inputIndex],
                                           outputIds [outputIndex]);
 
-        return 0;
+        return nullptr;
     }
 
     //==============================================================================

src/native/linux/juce_linux_AudioCDReader.cpp

@@ -42,7 +42,7 @@ const StringArray AudioCDReader::getAvailableCDNames()
 
 AudioCDReader* AudioCDReader::createReaderForCD (const int index)
 {
-    return 0;
+    return nullptr;
 }
 
 AudioCDReader::~AudioCDReader()

src/native/linux/juce_linux_Fonts.cpp

@@ -145,7 +145,7 @@ public:
                 return faces[i];
 
         if (! create)
-            return 0;
+            return nullptr;
 
         FreeTypeFontFace* newFace = new FreeTypeFontFace (familyName);
         faces.add (newFace);

src/native/linux/juce_linux_JackAudio.cpp

@@ -35,7 +35,7 @@ static void* juce_libjack_handle = nullptr;
 void* juce_load_jack_function (const char* const name)
 {
     if (juce_libjack_handle == 0)
-        return 0;
+        return nullptr;
 
     return dlsym (juce_libjack_handle, name);
 }
@@ -580,7 +580,7 @@ public:
                                           inputIds [inputIndex],
                                           outputIds [outputIndex]);
 
-        return 0;
+        return nullptr;
     }
 
     //==============================================================================

src/native/linux/juce_linux_Messaging.cpp

@@ -263,14 +263,14 @@ namespace LinuxErrorHandling
     // A protocol error has occurred
     static int juce_XErrorHandler (Display* display, XErrorEvent* event)
     {
-    #if JUCE_DEBUG_XERRORS
+       #if JUCE_DEBUG_XERRORS
         char errorStr[64] = { 0 };
         char requestStr[64] = { 0 };
 
         XGetErrorText (display, event->error_code, errorStr, 64);
         XGetErrorDatabaseText (display, "XRequest", String (event->request_code).toUTF8(), "Unknown", requestStr, 64);
         DBG ("ERROR: X returned " + String (errorStr) + " for operation " + String (requestStr));
-    #endif
+       #endif
 
         return 0;
     }
@@ -433,7 +433,7 @@ private:
 void* MessageManager::callFunctionOnMessageThread (MessageCallbackFunction* func, void* parameter)
 {
     if (LinuxErrorHandling::errorOccurred)
-        return 0;
+        return nullptr;
 
     return AsyncFunctionCaller::call (func, parameter);
 }

src/native/linux/juce_linux_Midi.cpp

@@ -432,8 +432,8 @@ MidiInput* MidiInput::createNewDevice (const String& deviceName, MidiInputCallba
 
 const StringArray MidiOutput::getDevices()                          { return StringArray(); }
 int MidiOutput::getDefaultDeviceIndex()                             { return 0; }
-MidiOutput* MidiOutput::openDevice (int)                            { return 0; }
-MidiOutput* MidiOutput::createNewDevice (const String&)             { return 0; }
+MidiOutput* MidiOutput::openDevice (int)                            { return nullptr; }
+MidiOutput* MidiOutput::createNewDevice (const String&)             { return nullptr; }
 MidiOutput::~MidiOutput()   {}
 void MidiOutput::reset()    {}
 bool MidiOutput::getVolume (float&, float&)     { return false; }
@@ -446,8 +446,8 @@ void MidiInput::start() {}
 void MidiInput::stop()  {}
 int MidiInput::getDefaultDeviceIndex()      { return 0; }
 const StringArray MidiInput::getDevices()   { return StringArray(); }
-MidiInput* MidiInput::openDevice (int, MidiInputCallback*)                  { return 0; }
-MidiInput* MidiInput::createNewDevice (const String&, MidiInputCallback*)   { return 0; }
+MidiInput* MidiInput::openDevice (int, MidiInputCallback*)                  { return nullptr; }
+MidiInput* MidiInput::createNewDevice (const String&, MidiInputCallback*)   { return nullptr; }
 
 #endif
 #endif

src/native/linux/juce_linux_Network.cpp

@@ -451,7 +451,7 @@ InputStream* URL::createNativeStream (const String& address, bool isPost, const
                                                            progressCallback, progressCallbackContext,
                                                            headers, timeOutMs, responseHeaders));
 
-    return wi->isError() ? 0 : wi.release();
+    return wi->isError() ? nullptr : wi.release();
 }
 
 

src/native/linux/juce_linux_Windowing.cpp

@@ -592,7 +592,7 @@ public:
     SharedImage* clone()
     {
         jassertfalse;
-        return 0;
+        return nullptr;
     }
 
     void blitToWindow (Window window, int dx, int dy, int dw, int dh, int sx, int sy)
@@ -2928,7 +2928,7 @@ void* MouseCursor::createMouseCursorFromImage (const Image& image, int hotspotX,
     Window root = RootWindow (display, DefaultScreen (display));
     unsigned int cursorW, cursorH;
     if (! XQueryBestCursor (display, root, imageW, imageH, &cursorW, &cursorH))
-        return 0;
+        return nullptr;
 
     Image im (Image::ARGB, cursorW, cursorH, true);
 
@@ -3268,7 +3268,7 @@ OpenGLContext* OpenGLComponent::createContext()
     ScopedPointer<WindowedGLContext> c (new WindowedGLContext (this, preferredPixelFormat,
                                                                contextToShareListsWith != 0 ? (GLXContext) contextToShareListsWith->getRawContext() : 0));
 
-    return (c->renderContext != 0) ? c.release() : 0;
+    return (c->renderContext != 0) ? c.release() : nullptr;
 }
 
 void juce_glViewport (const int w, const int h)