!892 [sync] PR-886: net: sched: fix NULL pointer dereference in mq_attach

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/886 
 
PR sync from:  Zhengchao Shao <shaozhengchao@huawei.com>
 https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/thread/XWHRWDMB4P3YRCQBLQMFWCV4DDLKNDHE/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/892

 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>