[gnome-control-center] network: Fix saving of IPv6 gateway

[Bastien Nocera <hadess src gnome org>]

commit dc14602e5598addf1ce92d89d644b5b5d8b204ae
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Jun 14 13:45:50 2016 +0200

    network: Fix saving of IPv6 gateway
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769230

 panels/network/connection-editor/ce-page-ip6.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/panels/network/connection-editor/ce-page-ip6.c b/panels/network/connection-editor/ce-page-ip6.c
index 51ad03e..703ab56 100644
--- a/panels/network/connection-editor/ce-page-ip6.c
+++ b/panels/network/connection-editor/ce-page-ip6.c
@@ -706,6 +706,7 @@ ui_to_setting (CEPageIP6 *page)
                         ret = FALSE;
                 } else {
                         widget_unset_error (g_object_get_data (G_OBJECT (row), "gateway"));
+                        have_gateway = TRUE;
                 }
 
                 if (!ret)