pt_fill
struct pt_entry *pt_fill(struct bgpd_addr *, int);
pte = pt_fill(prefix, prefixlen);
pte = pt_fill(prefix, prefixlen);
p = pt_fill(prefix, prefixlen);
pte = pt_fill(&addr, 0);
return rib_get(rib, pt_fill(prefix, prefixlen));
xre.prefix = pt_fill(subtree, subtreelen);