o_on
struct obj *o_on(unsigned int, struct obj *);
obj = o_on(id, billobjs);
else if(!(obj = o_on(id, invent)) &&
!(obj = o_on(id, fobj)) &&
!(obj = o_on(id, fcobj))) {
if ((obj = o_on(id, mtmp->minvent)))
if ((obj = o_on(id, mtmp->minvent)))