cleanup: correct errno value
cleanup: correct errno value

balanced/PyXB,pabigot/pyxb,CantemoInternal/pyxb,jonfoster/pyxb2,jonfoster/pyxb-upstream-mirror,pabigot/pyxb,balanced/PyXB,balanced/PyXB,jonfoster/pyxb-upstream-mirror,jonfoster/pyxb-upstream-mirror,CantemoInternal/pyxb,CantemoInternal/pyxb,jonfoster/pyxb2,jonfoster/pyxb2