!8668 phonet/pep: fix racy skb_queue_empty() use

Merge Pull Request from: @ci-robot 
 
PR sync from: Jinjie Ruan <ruanjinjie@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/GPDYNX5VSZM2IXICZ5XRAPV3IZKJN5C7/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9Q8LU 
 
Link:https://gitee.com/openeuler/kernel/pulls/8668

 

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