efl_ui_win: Fix dereference null return

Summary:
Coverity reports that efl_data_scope_safe_get returns NULL here
(checked 273 out of 285 times). Add an EINA_SAFETY check here before
trying to use 'sd'.

Fixes Coverity CID1399427

@fix

Depends on D8346

Reviewers: raster, cedric, zmike, bu5hm4n, stefan_schmidt

Reviewed By: cedric

Subscribers: #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8347

src/lib/elementary/efl_ui_win.c

@@ -9245,6 +9245,7 @@ EAPI Eina_Bool
 elm_win_noblank_get(const Evas_Object *obj)
 {
    Efl_Ui_Win_Data *sd = efl_data_scope_safe_get(obj, MY_CLASS);
+   EINA_SAFETY_ON_NULL_RETURN_VAL(sd, EINA_FALSE);
    return sd->noblank;
 }