!9260 v3 ftrace: Fix possible use-after-free issue in ftrace_location()

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Yejian <zhengyejian1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/QKNV6KRR2M2VSF4YGESJHQXAOWASYP4D/ 
 
https://gitee.com/src-openeuler/kernel/issues/IA6S5H 
 
Link:https://gitee.com/openeuler/kernel/pulls/9260

 

Reviewed-by: Xu Kuohai <xukuohai@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>