[glib] Add missing annotation to GDBusConnection::closed

[Matthias Clasen <matthiasc src gnome org>]

commit 02eed18a4e745b4b4a0f0d5d2892faaecbd2c23d
Author: Phil Clayton <phil clayton lineone net>
Date:   Tue Jun 12 16:09:19 2012 +0100

    Add missing annotation to GDBusConnection::closed
    
    Add annotation (allow-none) to the parameter error.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=677952

 gio/gdbusconnection.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gio/gdbusconnection.c b/gio/gdbusconnection.c
index 7f421c4..afc4ed4 100644
--- a/gio/gdbusconnection.c
+++ b/gio/gdbusconnection.c
@@ -1022,7 +1022,7 @@ g_dbus_connection_class_init (GDBusConnectionClass *klass)
    * @connection: The #GDBusConnection emitting the signal.
    * @remote_peer_vanished: %TRUE if @connection is closed because the
    * remote peer closed its end of the connection.
-   * @error: A #GError with more details about the event or %NULL.
+   * @error: (allow-none): A #GError with more details about the event or %NULL.
    *
    * Emitted when the connection is closed.
    *