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SDL_CreateRenderer is spuriously setting the current SDL error even when it returns a valid renderer.

triggering code:

SDL_Window *gamewindow;
SDL_Renderer *gamerenderer;
unsigned short width, height;

void check_error(const char *function)
{
	const char *errmsg;

	errmsg = SDL_GetError();

	if (strlen(errmsg)) {
		cout << "Error calling " << function << ": " << errmsg << endl;
		exit(1);
	}
}

static void setup_sdl()
{
	width = 32 * 16;
	height = 32 * 12;

	SDL_Init(SDL_INIT_VIDEO);
	check_error("SDL_Init");

	IMG_Init(IMG_INIT_PNG);
	check_error("IMG_Init");

	gamewindow = SDL_CreateWindow(
		"RPG Studio - (whatever your game is called here)"
		, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED
		, width, height, SDL_WINDOW_RESIZABLE);
	check_error("SDL_CreateWindow");
}

static void create_renderer()
{
	assert(!bubbletexture);
	assert(!gamerenderer);

	cout << "Creating renderer" << endl;

	check_error("NULL");
	gamerenderer = SDL_CreateRenderer(gamewindow, -1, SDL_RENDERER_SOFTWARE);

	if (!gamerenderer) {
		cout << "Got NULL gamerenderer" << endl;
		check_error("SDL_CreateRenderer");
	} else {
		if (strlen(SDL_GetError())) {
			cout << "Bogus SDL error: " << SDL_GetError();
		}
		SDL_ClearError();
	}
}

int main(int argc, char *argv[], char *envp[])
{
	setup_sdl();

	create_renderer();
}