validate: fix a typo
validate: fix a typo

5aa27794615e7d4521b1dbf1444b61388aacb852 introduced a typo.
This commit fixes it.

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible