QGrpcHttp2Channel: fix illegal access when printing

We are constructing 'hostUri' at this point. Don't use it for printing.

Coverity-Id: 894268
Pick-to: 6.10 6.9 6.8
Change-Id: I2b478de2d3865112978202959e1af07b17f7751a
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>

src/grpc/qgrpchttp2channel.cpp

@@ -1060,7 +1060,7 @@ QUrl QGrpcHttp2ChannelPrivate::sanitizeHostUri(const QUrl &rawUri,
         if (rawUri.scheme() != expected) {
             qCWarning(lcChannel,
                       "[%p] Unsupported transport protocol scheme '%s'. Fall back to '%s'.", this,
-                      qPrintable(hostUri.scheme()), qPrintable(expected));
+                      qPrintable(rawUri.scheme()), qPrintable(expected));
             sanitizedUri.setScheme(expected);
         }
     };