!9452 jffs2: prevent xattr node from overflowing the eraseblock

Merge Pull Request from: @ci-robot 
 
PR sync from: Wang Zhaolong <wangzhaolong1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/QIVYKBAB6S3KZQ6PXJ2NDTNDI3TYVJK3/ 
 
https://gitee.com/src-openeuler/kernel/issues/IA6SEU 
 
Link:https://gitee.com/openeuler/kernel/pulls/9452

 

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