Update ffs[1/2] time last written for cg's in clusteralloc();
Update ffs[1/2] time last written for cg's in
clusteralloc();

From mickey; ok pedro@

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