Schannel: Don't emit error when peer performs graceful disconnection

Change-Id: Ie19a31fc61223d954badc704324adf4f5f7d361e
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
(cherry picked from commit 3ff8629a0fbdf432086a47a1047d03ad457118c6)

src/plugins/tls/schannel/qtls_schannel.cpp

@@ -1659,8 +1659,6 @@ void TlsCryptographSchannel::transmit()
             } else if (status == SEC_I_CONTEXT_EXPIRED) {
                 // 'remote' has initiated a shutdown
                 disconnectFromHost();
-                setErrorAndEmit(d, QAbstractSocket::RemoteHostClosedError,
-                                schannelErrorToString(status));
                 break;
             } else if (status == SEC_I_RENEGOTIATE) {
                 // 'remote' wants to renegotiate