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

src/haptic/linux/SDL_syshaptic.c

@@ -188,7 +188,7 @@ static SDL_hapticlist_item *HapticByDevIndex(int device_index)
     }
 
     while (device_index > 0) {
-        SDL_assert(item);
+        SDL_assert(item != NULL);
         --device_index;
         item = item->next;
     }