!10141 vt_ioctl: fix array_index_nospec in vt_setactivate

Merge Pull Request from: @ci-robot 
 
PR sync from: Cai Xinchen <caixinchen1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/SBR6PGM7XKBSGGQJBFC4EQS3E3Q4OKX7/ 
 
https://gitee.com/src-openeuler/kernel/issues/IADG0Z 
 
Link:https://gitee.com/openeuler/kernel/pulls/10141