UpnpUnRegisterClient unregisters a control point application, unsubscribing all active subscriptions.
UpnpUnRegisterClient unregisters a control point application, unsubscribing all active subscriptions. After this call, the UpnpClient_Handle is no longer valid.UpnpUnRegisterClient is a synchronous call and generates no callbacks. The SDK generates no more callbacks after this function returns.