!3803 net/sched: cbs: Fix not adding cbs instance to list

Merge Pull Request from: @ci-robot 
 
PR sync from: Lu Wei <luwei32@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/OD6TRKOLRNGRO4BIDS2KE54Q2LF5U25Y/ 
 
https://gitee.com/src-openeuler/kernel/issues/I8TS78 
 
Link:https://gitee.com/openeuler/kernel/pulls/3803

 

Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>