fixed warning by adding a break

gameLoop.c

@@ -51,6 +51,7 @@ bool gameLoop(enum vehicle theme,SDL_Renderer* renderer) {
                 case SDL_QUIT:
                       end_game = true;
                       quit_game = true;
+                      break;
                 // any key input starts game and takes player input
                 case SDL_KEYDOWN:
                     start_game = true;