!7573 pstore: ram_core: fix possible overflow in persistent_ram_init_ecc()

Merge Pull Request from: @ci-robot 
 
PR sync from: Yang Yingliang <yangyingliang@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/67L4J2W6SYFS6YEVA2TWKYMS3ZNUL6W3/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9Q9FV 
 
Link:https://gitee.com/openeuler/kernel/pulls/7573

 

Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>