Small code style cleanup

--HG--
branch : minor

src/modules/filesystem/physfs/File.cpp

@@ -65,7 +65,7 @@ bool File::open(Mode mode)
 		throw love::Exception("Could not open file %s. Does not exist.", filename.c_str());
 
 	// Check whether the write directory is set.
-	if ((mode == MODE_APPEND || mode == MODE_WRITE) && (PHYSFS_getWriteDir() == 0) && !hack_setupWriteDirectory())
+	if ((mode == MODE_APPEND || mode == MODE_WRITE) && (PHYSFS_getWriteDir() == nullptr) && !hack_setupWriteDirectory())
 		throw love::Exception("Could not set write directory.");
 
 	// File already open?

src/modules/window/sdl/Window.cpp

@@ -448,7 +448,7 @@ bool Window::setWindow(int width, int height, WindowSettings *settings)
 		else
 		{
 			sdlflags |= SDL_WINDOW_FULLSCREEN;
-			SDL_DisplayMode mode = {0, width, height, 0, 0};
+			SDL_DisplayMode mode = {0, width, height, 0, nullptr};
 
 			// Fullscreen window creation will bug out if no mode can be used.
 			if (SDL_GetClosestDisplayMode(f.display, &mode, &mode) == nullptr)
@@ -738,9 +738,7 @@ const char *Window::getDisplayName(int displayindex) const
 	return name;
 }
 
-typedef Window::WindowSize WindowSize;
-
-std::vector<WindowSize> Window::getFullscreenSizes(int displayindex) const
+std::vector<Window::WindowSize> Window::getFullscreenSizes(int displayindex) const
 {
 	std::vector<WindowSize> sizes;
 
@@ -866,7 +864,7 @@ bool Window::setIcon(love::image::ImageData *imgd)
 	int h = imgd->getHeight();
 	int pitch = imgd->getWidth() * 4;
 
-	SDL_Surface *sdlicon = 0;
+	SDL_Surface *sdlicon = nullptr;
 
 	{
 		// We don't want another thread modifying the ImageData mid-copy.

src/modules/window/sdl/Window.h

@@ -34,7 +34,7 @@ namespace window
 namespace sdl
 {
 
-class Window : public love::window::Window
+class Window final : public love::window::Window
 {
 public: