Efl.Observable: Free an iterator after use in observers_update()

Summary:
- In _efl_observable_observers_update() iterator is allocated but not freed.
- This frees the iterator.

@fix

Reviewers: conr2d, jpeg

Reviewed By: jpeg

Subscribers: cedric, jpeg

Differential Revision: https://phab.enlightenment.org/D4994

src/lib/efl/interfaces/efl_observer.c

@@ -180,6 +180,8 @@ _efl_observable_observers_update(Eo *obj, Efl_Observable_Data *pd EINA_UNUSED, c
      {
         efl_observer_update(o, obj, key, data);
      }
+
+   eina_iterator_free(it);
 }
 
 typedef struct