Correct spelling of private variable
Correct spelling of private variable

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