[gnome-todo] window: don't leak GtdNotification

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 5ffffeeb2b0b42372224991115aa98931df858fe
Author: Victor Toso <me victortoso com>
Date:   Thu Sep 29 18:39:12 2016 +0200

    window: don't leak GtdNotification
    
    163 (40 direct, 123 indirect) bytes in 1 blocks are definitely lost in loss record 15,207 of 16,913
       at 0x9D709EF: g_type_create_instance (gtype.c:1844)
       by 0x9D57ED0: g_object_new_internal (gobject.c:1783)
       by 0x9D58B24: g_object_new_valist (gobject.c:2042)
       by 0x9D57AD0: g_object_new (gobject.c:1626)
       by 0x412EE6: gtd_notification_new (gtd-notification.c:285)
       by 0x429795: gtd_window_init (gtd-window.c:817)
       by 0x9D70B32: g_type_create_instance (gtype.c:1866)
       by 0x9D57ED0: g_object_new_internal (gobject.c:1783)
       by 0x9D58B24: g_object_new_valist (gobject.c:2042)
       by 0x9D57AD0: g_object_new (gobject.c:1626)
       by 0x429033: gtd_window_new (gtd-window.c:633)
       by 0x41CBF8: run_window (gtd-application.c:169)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772212

 src/gtd-window.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/gtd-window.c b/src/gtd-window.c
index 6a07476..bd9104f 100644
--- a/src/gtd-window.c
+++ b/src/gtd-window.c
@@ -639,6 +639,9 @@ gtd_window_new (GtdApplication *application)
 static void
 gtd_window_finalize (GObject *object)
 {
+  GtdWindowPrivate *priv = GTD_WINDOW (object)->priv;
+
+  g_clear_object (&priv->loading_notification);
   G_OBJECT_CLASS (gtd_window_parent_class)->finalize (object);
 }