part of a larger patch to convert ErrCode to strong_int

Change-Id: Ia56e5d6d8c4217d6f258e2113d20ce737977892f
Reviewed-on: https://gerrit.libreoffice.org/38813Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>