MPF_MULTIPATH
nhg->nhg_flags = MPF_MULTIPATH;
_Static_assert(MPF_MULTIPATH == NHF_MULTIPATH,
KASSERT(((nhg->nhg_flags & MPF_MULTIPATH) != 0), ("nhop is not mpath"));
KASSERT(((nhg->nhg_flags & MPF_MULTIPATH) != 0), ("nhop is not mpath"));
KASSERT(((nhg->nhg_flags & MPF_MULTIPATH) != 0), ("nhop is not mpath"));