!5916 ext4: fix double-free of blocks due to wrong extents moved_len

Merge Pull Request from: @ci-robot 
 
PR sync from: Long Li <leo.lilong@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/TMOPTMMH4OS3EI26K53NOJQAXMKB7ILN/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9E2F9 
 
Link:https://gitee.com/openeuler/kernel/pulls/5916

 

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