Fix sdk/lib/io errors found by the analyzer.

sdk/lib/io/secure_server_socket.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 /**
  * The [SecureServerSocket] is a server socket, providing a stream of high-level
  * [Socket]s.
  *
@@ skipping 192 matching lines @@
                                      onDone: onDone,
                                      cancelOnError: cancelOnError);
   }
 
   /**
    * Returns the port used by this socket.
    */
   int get port => _socket.port;
 
   /**
+   * Returns the address used by this socket.
+   */
+  InternetAddress get address => _socket.address;
+
+  /**
    * Closes the socket. The returned future completes when the socket
    * is fully closed and is no longer bound.
    */
   Future<RawSecureServerSocket> close() {
     _closed = true;
     return _socket.close().then((_) => this);
   }
 
   void _onData(RawSocket connection) {
     var remotePort;
@@ skipping 46 matching lines @@
       _subscription = _socket.listen(_onData,
                                      onDone: _onDone,
                                      onError: _onError);
     } else {
       close();
     }
   }
 }