Finishes an operation started with gio.dbus_connection.DBusConnection.call.
a #GAsyncResult obtained from the #GAsyncReadyCallback passed to gio.dbus_connection.DBusConnection.call
null if error is set. Otherwise a non-floating #GVariant tuple with return values. Free with glib.variant.VariantG.unref.
Finishes an operation started with gio.dbus_connection.DBusConnection.call.