!9737 net/9p: fix uninit-value in p9_client_rpc()

Merge Pull Request from: @ci-robot 
 
PR sync from: Yang Yingliang <yangyingliang@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/OEFVYOGLXO6ATOQPCYJN5GZ7AZFGOTS5/ 
 
https://gitee.com/src-openeuler/kernel/issues/IA8AEF 
 
Link:https://gitee.com/openeuler/kernel/pulls/9737

 

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