[evolution-ews] Fix a crash with evo 2.32.

[Akhil Laddha <lakhil src gnome org>]

commit bd37e305ea478d72ee8e3c8f4faaa5df8f07287a
Author: Chenthill Palanisamy <pchenthill suse com>
Date:   Mon Oct 3 16:42:52 2011 +0530

    Fix a crash with evo 2.32.

 src/calendar/e-cal-backend-ews.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/calendar/e-cal-backend-ews.c b/src/calendar/e-cal-backend-ews.c
index a1f8007..b7b3399 100644
--- a/src/calendar/e-cal-backend-ews.c
+++ b/src/calendar/e-cal-backend-ews.c
@@ -290,7 +290,7 @@ e_cal_backend_ews_set_default_zone (ECalBackend *backend, EDataCal *cal, EServer
 
 	PRIV_LOCK (priv);
 
-	if (priv->default_zone)
+	if (priv->default_zone && priv->default_zone != icaltimezone_get_utc_timezone ())
 		icaltimezone_free (priv->default_zone, 1);
 
 	/* Set the default timezone to it. */