unregister

Remove this client object from D-Bus, if register has already been called.

If the object is not registered, this method may be called, but has no effect.

Releasing the last reference to the object also has the same effect as calling this method, but this method should be preferred, as it has more deterministic behaviour.

If the object still exists, register may be used to attempt to register it again.

Parameters:

this	a client, which may already have been registered with register, or not