[gtk+] toolitemgroup: Fix the previous change

[Matthias Clasen <matthiasc src gnome org>]

commit 0f4663728e1627c18ce554fb477f9a73f8093d5d
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Oct 27 12:53:43 2015 -0400

    toolitemgroup: Fix the previous change
    
    dispose can be called more than once.

 gtk/gtktoolitemgroup.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtktoolitemgroup.c b/gtk/gtktoolitemgroup.c
index 6d78378..1b734b5 100644
--- a/gtk/gtktoolitemgroup.c
+++ b/gtk/gtktoolitemgroup.c
@@ -523,7 +523,8 @@ gtk_tool_item_group_dispose (GObject *object)
     }
 
   g_clear_object (&priv->settings);
-  gtk_widget_destroy (priv->header);
+  if (priv->header)
+    gtk_widget_destroy (priv->header);
   g_clear_object (&priv->header);
 
   G_OBJECT_CLASS (gtk_tool_item_group_parent_class)->dispose (object);