!7669 btrfs: send: handle path ref underflow in header iterate_inode_ref()

Merge Pull Request from: @ci-robot 
 
PR sync from: Wang Zhaolong <wangzhaolong1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/M3EFYV7CF2SKNA7MKDQA26NG2JCNKDTT/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9QGIK 
 
Link:https://gitee.com/openeuler/kernel/pulls/7669

 

Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>