!6396 tracing/trigger: Fix to return error if failed to alloc snapshot

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Yejian <zhengyejian1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/BZIQHMQPSYOLELBNBS2VLZRNPRS5AFHS/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9HL6U 
 
Link:https://gitee.com/openeuler/kernel/pulls/6396

 

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