natPlainSocketImplPosix.cc (create): Return if already created.

natPlainSocketImplPosix.cc (create): Return if already created.

	https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=233406
	* gnu/java/net/natPlainSocketImplPosix.cc (create): Return if
	already created.
	* gnu/java/net/PlainSocketImpl.java (getLocalAddress): Handle case
	where localport is -1.
	(create): Now public.
	* gnu/java/nio/SocketChannelImpl.java (SocketChannelImpl): Call
	'create' on the socket.

From-SVN: r123440