!1905 tracing: Fix memleak due to race between current_tracer and trace

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Yejian <zhengyejian1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/X5NGIF3RFX5SWAM7NSJDX424RVKQJLG2/ 
 
https://gitee.com/openeuler/kernel/issues/I7WMCI 
 
Link:https://gitee.com/openeuler/kernel/pulls/1905

 

Reviewed-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>