ipfw_objhash_count
count = ipfw_objhash_count(ii);
uint32_t ipfw_objhash_count(struct namedobj_instance *ni);
count = ipfw_objhash_count(CHAIN_TO_SRV(chain));
count = ipfw_objhash_count(CHAIN_TO_NI(ch));
count = ipfw_objhash_count(vi);