efl_ui_win: Fix dereference null return value

Summary:
Coverity reports 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 CID1399425

@fix

Depends on D8348

Reviewers: raster, cedric, zmike, bu5hm4n, stefan_schmidt

Reviewed By: cedric

Subscribers: #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8349

src/lib/elementary/efl_ui_win.c

@@ -9236,6 +9236,7 @@ EAPI void
 elm_win_noblank_set(Evas_Object *obj, Eina_Bool noblank)
 {
    Efl_Ui_Win_Data *sd = efl_data_scope_safe_get(obj, MY_CLASS);
+   EINA_SAFETY_ON_NULL_RETURN(sd);
    noblank = !!noblank;
    if (sd->noblank == noblank) return;
    sd->noblank = noblank;