!1217 sched/rt: Fix possible warn when push_rt_task

Merge Pull Request from: @ci-robot 
 
PR sync from: Hui Tang <tanghui20@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/YBGT2EBOTBD7PFWTPX3DX74QNLLTRRVR/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/1217

 

Reviewed-by: Zucheng Zheng <zhengzucheng@huawei.com>
Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>