free_chunks
chunk = free_chunks(lp, -1);
const struct diskchunk *free_chunks(const struct disklabel *, int);
chunk = free_chunks(lp, partno);
chunk = free_chunks(lp, partno);
chunk = free_chunks(&newlab, -1);
chunk = free_chunks(lp, -1);
chunk = free_chunks(lp, -1);