Libport.Asio: Call onError when closing with close().
Libport.Asio: Call onError when closing with close().

	* lib/libport/asio.cc (close): Force an onErrorFunc call when
	closing, since we disconnect the backend immediately.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport