[gnome-calendar] month-view: fix sigsegv if end_date is not created

[Erick Pérez Castellanos <erickpc src gnome org>]

commit d1a7c6ee2433e8fd5e40cb28ab77fa575a03941f
Author: Erick Pérez Castellanos <erick red gmail com>
Date:   Fri Dec 12 23:26:54 2014 -0500

    month-view: fix sigsegv if end_date is not created

 src/gcal-month-view.c |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/src/gcal-month-view.c b/src/gcal-month-view.c
index a7a05ba..0b019e3 100644
--- a/src/gcal-month-view.c
+++ b/src/gcal-month-view.c
@@ -1058,14 +1058,14 @@ gcal_month_view_button_release (GtkWidget      *widget,
       end_date = gcal_dup_icaltime (priv->date);
       end_date->day = j - priv->days_delay;
       end_date->is_date = 1;
-    }
 
-  if (start_date->day > end_date->day)
-    {
-      gint day;
-      day = start_date->day;
-      start_date->day = end_date->day;
-      end_date->day = day;
+      if (start_date->day > end_date->day)
+        {
+          gint day;
+          day = start_date->day;
+          start_date->day = end_date->day;
+          end_date->day = day;
+        }
     }
 
   g_signal_emit_by_name (GCAL_VIEW (widget), "create-event", start_date, end_date, x, y);