get_child_t
cuidp = get_child_t(obj, OBJ_PORTAL);
uint32_t *get_child_t(isns_obj_t *, int);
uint32_t *cuid = get_child_t(obj, OBJ_ISCSI);
cuidp = get_child_t(obj, child_type);
up = get_child_t(parent, et);
uint32_t *uidp = get_child_t(obj, type);