in favour of ErrCode.
Part of a larger patch to convert ErrCode to strong_int

Change-Id: Ia846bfc93c58c85c6a6cec79e9d19b9ecbd1c05f
Reviewed-on: https://gerrit.libreoffice.org/38783Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>