[gnome-contacts] Contact: Make keep_widget_uptodate callback owned

[Alexander Larsson <alexl src gnome org>]

commit 1685c6a7a0937b82ead2a3e2d7c71facb8a0107e
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Jun 12 11:10:28 2013 +0200

    Contact: Make keep_widget_uptodate callback owned
    
    Without this the callback data will not get reffed when this is called
    so it may later point to uninitialized memory. This happened to me
    when deleting a contact and then undoing that, since ContactSheet.update()
    had exited so the closure was freed but the keep_uptodate stuff
    still referenced it.

 src/contacts-contact.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/contacts-contact.vala b/src/contacts-contact.vala
index f7f48ad..48c5197 100644
--- a/src/contacts-contact.vala
+++ b/src/contacts-contact.vala
@@ -1432,7 +1432,7 @@ public class Contacts.Contact : GLib.Object  {
     }
   }
 
-  public void keep_widget_uptodate (Widget w, Gtk.Callback callback) {
+  public void keep_widget_uptodate (Widget w, owned Gtk.Callback callback) {
     callback(w);
     ulong id = this.changed.connect ( () => { callback(w); });
     w.destroy.connect (() => { this.disconnect (id); });