Removed not needed call to SDL_free().

src/video/dummy/SDL_nullvideo.c

@@ -82,7 +82,6 @@ DUMMY_CreateDevice(int devindex)
     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
     if (!device) {
         SDL_OutOfMemory();
-        SDL_free(device);
         return (0);
     }