[gtk/kill-containers] fixup actionbar

[Matthias Clasen <matthiasc src gnome org>]

commit 22bda23cfa0aa42d25418f35d36ad0892067a95a
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 7 00:44:58 2020 -0400

    fixup actionbar

 gtk/gtkactionbar.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkactionbar.c b/gtk/gtkactionbar.c
index eadb86e043..ed41fced9c 100644
--- a/gtk/gtkactionbar.c
+++ b/gtk/gtkactionbar.c
@@ -126,15 +126,12 @@ gtk_action_bar_dispose (GObject *object)
 {
   GtkActionBar *self = GTK_ACTION_BAR (object);
 
-  gtk_center_box_set_start_widget (GTK_CENTER_BOX (self->center_box), NULL);
-  gtk_center_box_set_center_widget (GTK_CENTER_BOX (self->center_box), NULL);
-  gtk_center_box_set_end_widget (GTK_CENTER_BOX (self->center_box), NULL);
+  g_clear_pointer (&self->revealer, gtk_widget_unparent);
 
+  self->center_box = NULL;
   self->start_box = NULL;
   self->end_box = NULL;
 
-  gtk_widget_unparent (self->revealer);
-
   G_OBJECT_CLASS (gtk_action_bar_parent_class)->dispose (object);
 }