KVM: s390: use created_vcpus in more places

KVM: s390: use created_vcpus in more places

commit b1afe4a8d680 ("KVM: s390: use kvm->created_vcpus") introduced
kvm->created_vcpus to avoid races with the existing kvm->online_vcpus
scheme. One place was "forgotten" and one new place was "added".
Let's fix those.

Reported-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Fixes: aa5c9fd1d228 ("KVM: s390: gs support for kvm guests")
Fixes: b1afe4a8d680 ("KVM: s390: use kvm->created_vcpus")