re PR libgcj/10868 (java.net.ServerSocket's constructors create and leak extra sockets)

re PR libgcj/10868 (java.net.ServerSocket's constructors create and leak extra sockets)

	* java/net/Socket.java (Socket (SocketImpl)): Don't allow null
	SocketImpl. Update Javadoc.
	(bind): Call close() not impl.close() in event of exception.
	(connect): Likewise.
	Remove superfluous null checks throughout.
	* java/net/ServerSocket.java (ServerSocket (int, int, InetAddress)):
	Don't create an extra socket. Fix for PR libgcj/10868.
	(bind): Clean up exception handling.
	Remove superfluous null checks throughout.

From-SVN: r70219