so revert some of the changes from

    commit 7a1c21e5
    loplugin:simplifybool for negation of comparison operator

Change-Id: I937d575b86c1e418805d399b0dc16ae91876b4fe
Reviewed-on: https://gerrit.libreoffice.org/45130Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>