elm/diskselector: fix handling in theme data setup

Summary:
the previous code checked for the object which was required to execute
the remainder of the function, then returned if that object existed instead
of continuing with the function. hello?

@fix
Depends on D8956

Reviewers: devilhorns

Reviewed By: devilhorns

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8957

src/lib/elementary/elm_diskselector.c

@@ -784,7 +784,7 @@ _theme_data_get(Evas_Object *obj)
    ELM_DISKSELECTOR_DATA_GET(obj, sd);
 
    blank = eina_list_data_get(sd->right_blanks);
-   if (blank) return;
+   if (!blank) return;
 
    str = edje_object_data_get(blank, "len_threshold");
    if (str) sd->len_threshold = MAX(0, atoi(str));