sceNetInet: TCP socket states and bind's port sharing

Following pspautotests net/inet/errors, states and reuse:
- bind decides itself whether a port is in use, as 4.4BSD's in_pcbbind()
  does with SO_REUSEADDR and SO_REUSEPORT. The host can't, since its
  sockets have both on for running several instances, so any number of
  sockets could bind the same port. A socket that's bound already is
  EINVAL.
- Shutting down the sending side of an unconnected TCP socket, or a
  failed connect, throws away its TCP state as in 4.4BSD's tcp_usrreq(),
  after which bind, listen, connect, accept and shutdown fail with
  EINVAL, and its port is free again. shutdown otherwise only fails for
  a bad how, and still reaches the host, so a thread waiting in accept
  wakes up.
- listen on an unbound TCP socket binds one, which Winsock didn't, and on
  a connected one succeeds.
- connect on a listening socket is EOPNOTSUPP. Winsock's WSAEINVAL for
  it looked like a connect in progress, and a blocking socket waited
  forever. A second connect on a loopback connection the host hasn't
  noticed finishing is EISCONN once it has.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Core/HLE/SocketManager.cpp

@@ -87,6 +87,9 @@ InetSocket *SocketManager::AdoptSocket(int *index, SOCKET hostSocket, const Inet
 	inetSock->addr.clear();
 	inetSock->port = 0;
 	inetSock->upnpPort = 0;
+	inetSock->boundPort = 0;
+	inetSock->tcpClosed = false;
+	inetSock->listening = false;
 	return inetSock;
 }