[gobject-introspection] Update annotations from glib git

[Martin Pitt <martinpitt src gnome org>]

commit 29ef1a98018ed5e1999498310fd96106cf106f9b
Author: Martin Pitt <martinpitt gnome org>
Date:   Tue Sep 11 14:51:07 2012 +0200

    Update annotations from glib git

 gir/gio-2.0.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gir/gio-2.0.c b/gir/gio-2.0.c
index a092432..0231bc1 100644
--- a/gir/gio-2.0.c
+++ b/gir/gio-2.0.c
@@ -12635,7 +12635,7 @@
 /**
  * g_dbus_connection_call_sync:
  * @connection: A #GDBusConnection.
- * @bus_name: A unique or well-known bus name.
+ * @bus_name: (allow-none): A unique or well-known bus name or %NULL if @connection is not a message bus connection.
  * @object_path: Path of remote object.
  * @interface_name: D-Bus interface to invoke method on.
  * @method_name: The name of the method to invoke.
@@ -12729,7 +12729,7 @@
 /**
  * g_dbus_connection_call_with_unix_fd_list_sync:
  * @connection: A #GDBusConnection.
- * @bus_name: A unique or well-known bus name.
+ * @bus_name: (allow-none): A unique or well-known bus name or %NULL if @connection is not a message bus connection.
  * @object_path: Path of remote object.
  * @interface_name: D-Bus interface to invoke method on.
  * @method_name: The name of the method to invoke.