!3980 vhost: use kzalloc() instead of kmalloc() followed by memset()

Merge Pull Request from: @ci-robot 
 
PR sync from: Guo Mengqi <guomengqi3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/CM6V6GAYWW4RVUY7BQ6NUBS54PCA7POQ/ 
 
https://gitee.com/src-openeuler/kernel/issues/I8UW3U 
 
Link:https://gitee.com/openeuler/kernel/pulls/3980

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>