regression from
    commit b4fc9965
    loplugin:useuniqueptr in SdrHdlList

Change-Id: Ic49c60020b1d86b4c65cc4662393415b96af714e
Reviewed-on: https://gerrit.libreoffice.org/62222
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>