This fixes a build bug introduced by
commit fbf27730a36da573b1065c179f4d96b9a751f22f
Author: Daniel P. Berrangé <berrange@redhat.com>
Date: Mon Dec 16 11:16:51 2019 +0000
conf: add support for specifying CPU "dies" parameter
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>