add user data where is was missing

src/lv_core/lv_obj.h

@@ -612,16 +612,17 @@ void * lv_obj_allocate_ext_attr(lv_obj_t * obj, uint16_t ext_size);
 void lv_obj_refresh_ext_draw_pad(lv_obj_t * obj);
 
 #if LV_USE_ANIMATION
+
 /**
  * Animate an object
  * @param obj pointer to an object to animate
  * @param type type of animation from 'lv_anim_builtin_t'. 'OR' it with ANIM_IN or ANIM_OUT
  * @param time time of animation in milliseconds
  * @param delay delay before the animation in milliseconds
- * @param cb a function to call when the animation is ready
+ * @param ready_cb a function to call when the animation is ready
  */
 void lv_obj_animate(lv_obj_t * obj, lv_anim_builtin_t type, uint16_t time, uint16_t delay,
-                    void (*cb)(lv_obj_t *));
+                    lv_anim_ready_cb_t ready_cb);
 #endif
 
 /*=======================