!3651 nbd: get config_lock before sock_shutdown

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Lingfeng <lilingfeng3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/IDGNAPV7PCYAUJIBHYYJYXVTWOFGQ6A4/ 
 
https://gitee.com/openeuler/kernel/issues/I8S2P0 
 
Link:https://gitee.com/openeuler/kernel/pulls/3651

 

Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>