!5348 s390/ptrace: handle setting of fpc register correctly

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Zucheng <zhengzucheng@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/2VK7OF5YR2E3GU2M6KDDTJEOSSGR3XAY/ 
 
https://gitee.com/src-openeuler/kernel/issues/I96G7Q 
 
Link:https://gitee.com/openeuler/kernel/pulls/5348

 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>