Fixed bug 2130 - Two members of Windows WindowData not initialized

norfanin

SetupWindowData in SDL_windowswindow.c doesn't initialize two members of SDL_WindowData with NULL. This is an issue because other parts of the SDL code seem to make the assumption that this is the case. WIN_DestroyWindowFramebuffer for example uses data->mdc and data->hbm if they're not NULL.

src/video/windows/SDL_windowswindow.c

@@ -113,7 +113,7 @@ SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, SDL_bool created)
     SDL_WindowData *data;
 
     /* Allocate the window data */
-    data = (SDL_WindowData *) SDL_malloc(sizeof(*data));
+    data = (SDL_WindowData *) SDL_calloc(1, sizeof(*data));
     if (!data) {
         return SDL_OutOfMemory();
     }