[gnome-control-center] network: Fix a crash when clicking to forget a VPN on the editor

[Rui Matos <rtcm src gnome org>]

commit 2e7b23aa0019cd04e602be9c4838f458c97d9652
Author: Rui Matos <tiagomatos gmail com>
Date:   Tue Jan 26 16:30:54 2016 +0100

    network: Fix a crash when clicking to forget a VPN on the editor
    
    We need to keep a reference to the NetVpn instance or it might already
    be finalized when the editor window closes.

 panels/network/net-vpn.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/panels/network/net-vpn.c b/panels/network/net-vpn.c
index c6fdda1..94c1c10 100644
--- a/panels/network/net-vpn.c
+++ b/panels/network/net-vpn.c
@@ -406,6 +406,7 @@ editor_done (NetConnectionEditor *editor,
 {
         g_object_unref (editor);
         net_object_refresh (NET_OBJECT (vpn));
+        g_object_unref (vpn);
 }
 
 static void
@@ -432,7 +433,7 @@ vpn_proxy_edit (NetObject *object)
         net_connection_editor_set_title (editor, title);
         g_free (title);
 
-        g_signal_connect (editor, "done", G_CALLBACK (editor_done), vpn);
+        g_signal_connect (editor, "done", G_CALLBACK (editor_done), g_object_ref (vpn));
         net_connection_editor_run (editor);
 }