!2370 ipv4: fix null-deref in ipv4_link_failure

Merge Pull Request from: @ci-robot 
 
PR sync from: Lu Wei <luwei32@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/2NVOLPN6QHS7Z5IML4ZDIB6VRF6LTRL7/ 
 
https://gitee.com/src-openeuler/kernel/issues/I85DZB 
 
Link:https://gitee.com/openeuler/kernel/pulls/2370

 

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