When getting info on NUMA parameters for domain,
virCgroupGetCpusetMems() may be called. However, as of 43b67f2e
the call is guarded by check if memory controller is present.
Even though it may be not obvious instantly, NUMA parameters are
stored under cpuset controller. Therefore the check needs to look
like this:

  if (!virCgroupHasController(priv->cgroup,
                              VIR_CGROUP_CONTROLLER_CPUSET) ||
      virCgroupGetCpusetMems(priv->cgroup, &nodeset) < 0) {
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>