[gnome-todo] gtd-panel-today: fix crash due g_list_free on NULL

[Victor Toso de Carvalho <victortoso src gnome org>]

commit f14b056b79e43f39517efe9795cfa89ba3a6e7e7
Author: Victor Toso <me victortoso com>
Date:   Wed Nov 2 21:13:49 2016 +0100

    gtd-panel-today: fix crash due g_list_free on NULL
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773860

 plugins/today-panel/gtd-panel-today.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/plugins/today-panel/gtd-panel-today.c b/plugins/today-panel/gtd-panel-today.c
index d2bddf8..513a3ff 100644
--- a/plugins/today-panel/gtd-panel-today.c
+++ b/plugins/today-panel/gtd-panel-today.c
@@ -224,8 +224,7 @@ gtd_panel_today_finalize (GObject *object)
 
   g_clear_object (&self->menu);
   g_clear_pointer (&self->title, g_free);
-
-  g_list_free (self->task_list);
+  g_clear_pointer (&self->task_list, g_list_free);
 
   G_OBJECT_CLASS (gtd_panel_today_parent_class)->finalize (object);
 }