!2573 media: dvb-core: Fix use-after-free due to race condition at dvb_ca_en50221

Merge Pull Request from: @ci-robot 
 
PR sync from: Peng Zhang <zhangpeng362@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/RFLTDEHOKFAS4XTCHEIIVWOPBP53WOIZ/ 
 
https://gitee.com/src-openeuler/kernel/issues/I63D3C 
 
Link:https://gitee.com/openeuler/kernel/pulls/2573

 

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