[epiphany/wip/ephy-sync: 119/126] sync-service: Fix destroy_session function

[Gabriel - Cristian Ivascu <gabrielivascu src gnome org>]

commit e00b3908d8462e8a8ce43feffc54a51da51a6bca
Author: Gabriel Ivascu <ivascu gabriel59 gmail com>
Date:   Sat Aug 13 17:07:15 2016 +0300

    sync-service: Fix destroy_session function

 src/ephy-sync-service.c |    2 ++
 src/prefs-dialog.c      |    4 +---
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/ephy-sync-service.c b/src/ephy-sync-service.c
index 4e4be6b..49bc630 100644
--- a/src/ephy-sync-service.c
+++ b/src/ephy-sync-service.c
@@ -852,6 +852,8 @@ ephy_sync_service_destroy_session (EphySyncService *self,
   const gchar *endpoint = "session/destroy";
   const gchar *request_body = "{}";
 
+  if (sessionToken == NULL)
+    sessionToken = ephy_sync_service_get_token (self, TOKEN_SESSIONTOKEN);
   g_return_if_fail (sessionToken != NULL);
 
   url = g_strdup_printf ("%s%s%s",
diff --git a/src/prefs-dialog.c b/src/prefs-dialog.c
index 70164b9..ced3d20 100644
--- a/src/prefs-dialog.c
+++ b/src/prefs-dialog.c
@@ -351,13 +351,11 @@ on_sync_sign_out_button_clicked (GtkWidget   *button,
                                  PrefsDialog *dialog)
 {
   EphySyncService *service;
-  gchar *sessionToken;
 
   service = ephy_shell_get_global_sync_service (ephy_shell_get_default ());
-  sessionToken = ephy_sync_service_get_token (service, TOKEN_SESSIONTOKEN);
 
   /* Destroy session and delete tokens. */
-  ephy_sync_service_destroy_session (service, sessionToken);
+  ephy_sync_service_destroy_session (service, NULL);
   ephy_sync_service_clear_storage_credentials (service);
   ephy_sync_service_delete_all_tokens (service);
   ephy_sync_secret_forget_all_tokens ();