tipc_dest_find
if (tipc_dest_find(l, node, port))
dst = tipc_dest_find(l, node, port);
struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port);
if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
!tipc_dest_find(cong_links, node, 0) &&
!tipc_dest_find(clinks, skaddr.node, 0));
!tipc_dest_find(&tsk->cong_links, node, 0) &&