util/vhost-user-server: drop unnecessary QOM cast

We already have access to the value with the correct type (ioc and sioc
are the same QIOChannel).

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20200924151549.913737-4-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

util/vhost-user-server.c

@@ -337,7 +337,7 @@ static void vu_accept(QIONetListener *listener, QIOChannelSocket *sioc,
     server->ioc = QIO_CHANNEL(sioc);
     object_ref(OBJECT(server->ioc));
     qio_channel_attach_aio_context(server->ioc, server->ctx);
-    qio_channel_set_blocking(QIO_CHANNEL(server->sioc), false, NULL);
+    qio_channel_set_blocking(server->ioc, false, NULL);
     vu_client_start(server);
 }