Re-add SDL_assert() with non boolean ptr syntax (#8530)

src/haptic/android/SDL_syshaptic.c

@@ -59,7 +59,7 @@ static SDL_hapticlist_item *HapticByOrder(int index)
         return NULL;
     }
     while (index > 0) {
-        SDL_assert(item);
+        SDL_assert(item != NULL);
         --index;
         item = item->next;
     }