sal里面好像有bug，清理函数问题

int sal_netdev_cleanup(struct netdev *netdev)
{
    uint32_t idx = 0;
    int find_dev;
    do
    {
        find_dev = 0;
        sal_lock();
        for (idx = 0; idx < socket_table.max_socket; idx++)
        { 
            if (socket_table.sockets[idx] && socket_table.sockets[idx]->netdev == netdev)
            {
                rt_kprintf("===find \n");
                find_dev = 1;
                break;
            }
        }
        sal_unlock();
        if (find_dev)
        {
            rt_thread_mdelay(100);
        }
    }while (find_dev);
    return 0;
}