!6160 net/sched: act_mirred: don't override retval if we already lost the skb

Merge Pull Request from: @ci-robot 
 
PR sync from: Zhengchao Shao <shaozhengchao@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/7HNDVGN7HEO4MXWDG634J6EQY7CW2JGN/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9E2LZ 
 
Link:https://gitee.com/openeuler/kernel/pulls/6160

 

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