[glib] Document that vtable is not copied

[Matthias Clasen <matthiasc src gnome org>]

commit 9e25ec592ba32797230650b2236935deb2022960
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue May 25 10:43:29 2010 -0400

    Document that vtable is not copied

 gio/gdbusconnection.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gio/gdbusconnection.c b/gio/gdbusconnection.c
index b79e001..79c178b 100644
--- a/gio/gdbusconnection.c
+++ b/gio/gdbusconnection.c
@@ -3929,6 +3929,10 @@ obj_message_func (GDBusConnection *connection,
  * If an existing callback is already registered at @object_path and
  * @interface_name, then @error is set to #G_IO_ERROR_EXISTS.
  *
+ * Note that @vtable is not copied, so the struct you pass must exist until
+ * the path is unregistered. One possibility is to free @vtable at the
+ * same time as @user_data when @user_data_free_func is called.
+ *
  * GDBus automatically implements the standard D-Bus interfaces
  * org.freedesktop.DBus.Properties, org.freedesktop.DBus.Introspectable
  * and org.freedesktop.Peer, so you don't have to implement those for