[gnome-calendar] window: use g_clear_pointer instead of g_date_time_unref

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

commit af6f2141abc73be6292c8517143e4b73b73bc061
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sun Feb 28 14:11:09 2016 -0300

    window: use g_clear_pointer instead of g_date_time_unref
    
    This would handle the case where the datetime is NULL for us.

 src/gcal-window.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/gcal-window.c b/src/gcal-window.c
index db56c0b..7bcadbd 100644
--- a/src/gcal-window.c
+++ b/src/gcal-window.c
@@ -667,8 +667,8 @@ show_new_event_widget (GcalView   *view,
 
   if (window->event_creation_data != NULL)
     {
-      g_date_time_unref (window->event_creation_data->start_date);
-      g_date_time_unref (window->event_creation_data->end_date);
+      g_clear_pointer (&window->event_creation_data->start_date, g_date_time_unref);
+      g_clear_pointer (&window->event_creation_data->end_date, g_date_time_unref);
       g_free (window->event_creation_data);
     }