[gtk+] GtkPopover: Clean up default widget on dispose

[Matthias Clasen <matthiasc src gnome org>]

commit 2bb1ed69f0b317c82b2a2ef8663671104eb88ca4
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue May 12 07:57:04 2015 -0400

    GtkPopover: Clean up default widget on dispose
    
    We forgot to drop the ref we take. Thankfully our
    tests caught this.

 gtk/gtkpopover.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
index 827c593..ba2fcba 100644
--- a/gtk/gtkpopover.c
+++ b/gtk/gtkpopover.c
@@ -317,6 +317,8 @@ gtk_popover_dispose (GObject *object)
 
   popover_unset_prev_focus (popover);
 
+  g_clear_object (&priv->default_widget);
+
   G_OBJECT_CLASS (gtk_popover_parent_class)->dispose (object);
 }