QtNetwork: use const (and const APIs) more

For CoW types, prefer const methods to avoid needless detach()ing.

Mark predictNextRequest() as const, because this method
does not modify the object.

Change-Id: Ic94e2b31445ece46ab1423bf5b5f4e66d9a5b6ca
Reviewed-by: Edward Welbourne <edward.welbourne@theqtcompany.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/network/ssl/qsslsocket_openssl.cpp b/src/network/ssl/qsslsocket_openssl.cpp
index 35bdd1c87d..67b4550607 100644
--- a/src/network/ssl/qsslsocket_openssl.cpp
+++ b/src/network/ssl/qsslsocket_openssl.cpp
@@ -1234,7 +1234,7 @@ bool QSslSocketBackendPrivate::checkSslErrors()
             pauseSocketNotifiers(q);
             paused = true;
         } else {
-            setErrorAndEmit(QAbstractSocket::SslHandshakeFailedError, sslErrors.first().errorString());
+            setErrorAndEmit(QAbstractSocket::SslHandshakeFailedError, sslErrors.constFirst().errorString());
             plainSocket->disconnectFromHost();
         }
         return false;