minor fix

src/lv_core/lv_obj.c

@@ -741,7 +741,9 @@ void lv_obj_set_state(lv_obj_t * obj, lv_state_t new_state)
             }
         }
         if(cmp_res == _LV_STYLE_STATE_CMP_VISUAL_DIFF) {
+#if LV_STYLE_CACHE_LEVEL > 0
             _lv_obj_invalidate_style_cache(obj, part, LV_STYLE_PROP_ALL);
+#endif
         }
 
     }