calendar-server: Fix a memory leak

App will take ownership of the location string when the timezone
changes, but not when there was no change - free the memory in
that case.

https://bugzilla.gnome.org/show_bug.cgi?id=748226

src/calendar-server/gnome-shell-calendar-server.c

@@ -526,6 +526,10 @@ app_update_timezone (App *app)
       app->timezone_location = location;
       print_debug ("Using timezone %s", app->timezone_location);
     }
+  else
+    {
+      g_free (location);
+    }
 }
 
 static gboolean