eo: free vtable when erroring out

if there is a error when settings API to the vtable, free the vtable
instead of leaking it.

CID 1422015

Reviewed-by: Stefan Schmidt <stefan@datenfreihafen.org>
Differential Revision: https://phab.enlightenment.org/D11580

src/lib/eo/eo.c

@@ -1866,6 +1866,7 @@ efl_object_override(Eo *eo_id, const Efl_Object_Ops *ops)
              else
                {
                   _vtable_free(vtable, &obj->klass->vtable);
+                  free(vtable);
                }
 
              goto err;