Fix error message when SDL fails to initialize (#861)

Author: chrispurnell

src/input/api/SDL/SDLControllerProvider.cpp

@@ -32,7 +32,7 @@ SDLControllerProvider::SDLControllerProvider()
 	SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_LUNA, "1");
 
 	if (SDL_Init(SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER | SDL_INIT_HAPTIC | SDL_INIT_EVENTS) < 0) 
-		throw std::runtime_error(fmt::format("couldn't initialize SDL: %s", SDL_GetError()));
+		throw std::runtime_error(fmt::format("couldn't initialize SDL: {}", SDL_GetError()));
 
 
 	if (SDL_GameControllerEventState(SDL_ENABLE) < 0) {