[SDL2] pointer boolean (#8523)

test/checkkeys.c

@@ -269,14 +269,14 @@ int main(int argc, char *argv[])
     window = SDL_CreateWindow("CheckKeys Test",
                               SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
                               640, 480, 0);
-    if (window == NULL) {
+    if (!window) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create 640x480 window: %s\n",
                      SDL_GetError());
         quit(2);
     }
 
     renderer = SDL_CreateRenderer(window, -1, 0);
-    if (renderer == NULL) {
+    if (!renderer) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create renderer: %s\n",
                      SDL_GetError());
         quit(2);