[gnome-calendar] window: fix warning

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

commit eb10c84811c4b18637b43037502a64d027d2fd89
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sun Mar 5 20:36:41 2017 -0300

    window: fix warning

 src/gcal-window.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gcal-window.c b/src/gcal-window.c
index d4ed8df..263be51 100644
--- a/src/gcal-window.c
+++ b/src/gcal-window.c
@@ -416,9 +416,9 @@ update_active_date (GcalWindow   *window,
     {
       gint offset;
 
+      date_start = g_date_time_new_local (new_date->year, new_date->month, new_date->day, 0, 0, 0);
       offset = g_date_time_get_day_of_week (date_start) % 7 + get_first_weekday ();
 
-      date_start = g_date_time_new_local (new_date->year, new_date->month, new_date->day, 0, 0, 0);
       date_start = g_date_time_add_days (date_start, offset);
       range_start = g_date_time_to_unix (date_start);