efl_page_transition_scroll: fix warning the dereference before null check

Summary: if target is null, then terminate the function because it is not intended.

Test Plan: N/A

Reviewers: eunue

Reviewed By: eunue

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D7127

src/lib/elementary/efl_page_transition_scroll.c

@@ -405,6 +405,8 @@ _efl_page_transition_scroll_curr_page_change(Eo *obj EINA_UNUSED,
           }
         pi->pos = pi->id - (pd->side_page_num + 1);
 
+        if (!target) return;
+
         EINA_RECTANGLE_SET(&pi->temp,
                            target->geometry.x,
                            target->geometry.y,