!8175 jfs: fix array-index-out-of-bounds in diAlloc

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Lingfeng <lilingfeng3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/5IETCHIZ4TIRIOL7Y4VBS66WZPWHYGLU/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9RFMU 
 
Link:https://gitee.com/openeuler/kernel/pulls/8175

 

Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>