[Vala] add_inet_port's(GSocketListener) source_object is optional

[Darren Hoo <darren hoo gmail com>]

Hi,
I am trying the GIONetworkingSample [1].
compiling the gio-server sample has the following warning:

warning: Argument 2: Cannot pass null to non-null parameter type
                                service.add_inet_port (8080, null);
                                                             ^^^^
according the signature of g_socket_listener_add_inet_port [2]
the source_object is optional.so I  assume the value source_object
passed to add_inet_port can be nullable.

Am I right?

diff --git a/vapi/gio-2.0.vapi b/vapi/gio-2.0.vapi
index 2cba3a7..6af4d5b 100644
--- a/vapi/gio-2.0.vapi
+++ b/vapi/gio-2.0.vapi
@@ -785,7 +785,7 @@ namespace GLib {
                public void accept_socket_async (GLib.Cancellable? cancellable,
GLib.AsyncReadyCallback callback);
                public unowned GLib.Socket accept_socket_finish (GLib.AsyncResult
_result, out unowned GLib.Object source_object) throws GLib.Error;
                public bool add_address (GLib.SocketAddress address,
GLib.SocketType type, GLib.SocketProtocol protocol, GLib.Object
source_object, out unowned GLib.SocketAddress effective_address)
throws GLib.Error;
-               public bool add_inet_port (uint16 port, GLib.Object source_object)
throws GLib.Error;
+               public bool add_inet_port (uint16 port, GLib.Object? source_object)
throws GLib.Error;
                public bool add_socket (GLib.Socket socket, GLib.Object
source_object) throws GLib.Error;
                [NoWrapper]
                public virtual void changed ();

[1] http://live.gnome.org/Vala/GIONetworkingSample
[2] http://library.gnome.org/devel/gio/unstable/GSocketListener.html#g-socket-listener-add-inet-port