[gnome-control-center] universal-access: Fix possible crash when exiting panel

[Bastien Nocera <hadess src gnome org>]

commit 6c3daeaac403b8dfa88c7af2a19feee1a48489fd
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Feb 9 03:02:42 2018 +0100

    universal-access: Fix possible crash when exiting panel
    
    The gnome-settings-daemon mouse settings (double-click delay) and repeat
    keys settings were both missing destroying their GSettings, meaning that
    we could crash if the setting changed outside the panel, or when coming
    and going to the panel.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=793322

 panels/universal-access/cc-ua-panel.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/panels/universal-access/cc-ua-panel.c b/panels/universal-access/cc-ua-panel.c
index f0928555e..a364ed0a3 100644
--- a/panels/universal-access/cc-ua-panel.c
+++ b/panels/universal-access/cc-ua-panel.c
@@ -138,7 +138,9 @@ cc_ua_panel_dispose (GObject *object)
   g_clear_object (&priv->interface_settings);
   g_clear_object (&priv->kb_settings);
   g_clear_object (&priv->mouse_settings);
+  g_clear_object (&priv->kb_desktop_settings);
   g_clear_object (&priv->application_settings);
+  g_clear_object (&priv->gsd_mouse_settings);
 
   g_clear_object (&priv->zoom_options);