testspriteminimal: only quit when escape is pressed

test/testspriteminimal.c

···
 
     /* Check for events */
     while (SDL_PollEvent(&event)) {
-        if (event.type == SDL_EVENT_QUIT || event.type == SDL_EVENT_KEY_DOWN) {
+        if (event.type == SDL_EVENT_QUIT ||
+            (event.type == SDL_EVENT_KEY_DOWN && event.key.key == SDLK_ESCAPE)) {
             done = 1;
         }
     }