!1491 [sync] PR-1476: ipv6/addrconf: fix a potential refcount underflow for idev

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1476 
 
PR sync from: Ziyang Xuan <william.xuanziyang@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/5A5SKE5UUQPIEHB7CMKLHKSRWTO2SF4R/ 
 
https://gitee.com/openeuler/kernel/issues/I7M991 
 
Link:https://gitee.com/openeuler/kernel/pulls/1491

 

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