fix a bug in utils/lll.c for the computation of the transformation matrix
fix a bug in utils/lll.c for the computation of the transformation matrix

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs