Lock the vnode in ffs_unmount() before passing it too vinvalbuf() and VOP_CLOSE() since both of them expected it too be locked.
Lock the vnode in ffs_unmount() before passing it too vinvalbuf()
and VOP_CLOSE() since both of them expected it too be locked.

ok art@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars