!10173 netrom: Fix a memory leak in nr_heartbeat_expiry()

Merge Pull Request from: @ci-robot 
 
PR sync from: Liu Jian <liujian56@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/EVNVKWR7YGMOTSIKQDYDWITXNN73IREK/ 
 
https://gitee.com/src-openeuler/kernel/issues/IACZLQ 
 
Link:https://gitee.com/openeuler/kernel/pulls/10173

 

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