[gtk+] headerbar: Don't leak widgets

[Matthias Clasen <matthiasc src gnome org>]

commit 547970b0bc7b9f6d3fb9e828e84c8bfa6a79cf36
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Nov 10 15:03:16 2016 -0500

    headerbar: Don't leak widgets
    
    We were not properly freeing separators that we end up
    not using.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774066

 gtk/gtkheaderbar.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkheaderbar.c b/gtk/gtkheaderbar.c
index 592abe3..e630432 100644
--- a/gtk/gtkheaderbar.c
+++ b/gtk/gtkheaderbar.c
@@ -458,8 +458,10 @@ _gtk_header_bar_update_window_buttons (GtkHeaderBar *bar)
 
           if (n_children == 0)
             {
-              gtk_widget_destroy (box);
-              gtk_widget_destroy (separator);
+              g_object_ref_sink (box);
+              g_object_unref (box);
+              g_object_ref_sink (separator);
+              g_object_unref (separator);
               continue;
             }