[evolution-ews] Bug 680960 - Invalid g_object_ref() call on evolution start

[Matthew Barnes <mbarnes src gnome org>]

commit dcdc8c832e4343d288e85729b42c59c78a1fab20
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Aug 1 07:47:24 2012 -0400

    Bug 680960 - Invalid g_object_ref() call on evolution start

 src/camel/camel-ews-store.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/src/camel/camel-ews-store.c b/src/camel/camel-ews-store.c
index 5ee9cfd..ba3ff6f 100644
--- a/src/camel/camel-ews-store.c
+++ b/src/camel/camel-ews-store.c
@@ -1036,9 +1036,18 @@ ews_get_name (CamelService *service,
 EEwsConnection *
 camel_ews_store_ref_connection (CamelEwsStore *ews_store)
 {
+	EEwsConnection *connection = NULL;
+
 	g_return_val_if_fail (CAMEL_IS_EWS_STORE (ews_store), NULL);
 
-	return g_object_ref (ews_store->priv->connection);
+	g_mutex_lock (ews_store->priv->connection_lock);
+
+	if (ews_store->priv->connection != NULL)
+		connection = g_object_ref (ews_store->priv->connection);
+
+	g_mutex_unlock (ews_store->priv->connection_lock);
+
+	return connection;
 }
 
 static CamelFolder *