HTTP internals: do not access reply that was deleted already

... rather than crashing.

Task-number: QTBUG-32404
Change-Id: Ia2f938394fb451459564ef5966419f952b3e2d0e
Reviewed-by: Richard J. Moore <rich@kde.org>

src/network/access/qhttpnetworkconnectionchannel.cpp

@@ -1116,6 +1116,9 @@ void QHttpNetworkConnectionChannel::_q_error(QAbstractSocket::SocketError socket
                 errorCode = QNetworkReply::RemoteHostClosedError;
             }
         } else if (state == QHttpNetworkConnectionChannel::ReadingState) {
+            if (!reply)
+                break;
+
             if (!reply->d_func()->expectContent()) {
                 // No content expected, this is a valid way to have the connection closed by the server
                 return;