!6123 xen/events: close evtchn after mapping cleanup

Merge Pull Request from: @ci-robot 
 
PR sync from: Guo Mengqi <guomengqi3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/YLGZIKUFQ3TMM7WGOCS5VLFVNQDUA3DP/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9E2GS 
 
Link:https://gitee.com/openeuler/kernel/pulls/6123

 

Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>