Fix a Turn TCP port issue.

webrtc/base/asynctcpsocket.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 109 matching lines @@
   return socket_->GetError();
 }
 
 void AsyncTCPSocketBase::SetError(int error) {
   return socket_->SetError(error);
 }
 
 int AsyncTCPSocketBase::SendTo(const void *pv, size_t cb,
                                const SocketAddress& addr,
                                const rtc::PacketOptions& options) {
-  if (addr == GetRemoteAddress())
+  const SocketAddress& remote_address = GetRemoteAddress();
+  if (addr == remote_address)
     return Send(pv, cb, options);
-
-  ASSERT(false);
+  // Remote address may be empty if there is a sudden network change.
+  ASSERT(remote_address.IsNil());
   socket_->SetError(ENOTCONN);
   return -1;
 }
 
 int AsyncTCPSocketBase::SendRaw(const void * pv, size_t cb) {
   if (outpos_ + cb > outsize_) {
     socket_->SetError(EMSGSIZE);
     return -1;
   }
 
@@ skipping 146 matching lines @@
       memmove(data, data + kPacketLenSize + pkt_len, *len);
     }
   }
 }
 
 void AsyncTCPSocket::HandleIncomingConnection(AsyncSocket* socket) {
   SignalNewConnection(this, new AsyncTCPSocket(socket, false));
 }
 
 }  // namespace rtc