修正在多核时，运行在另外核上的idle任务有可能会插在rt_thread_exit调用rt_schedule之前释放其资源的问题
修正在多核时，运行在另外核上的idle任务有可能会插在rt_thread_exit调用rt_schedule之前释放其资源的问题

ArdaFu/rt-thread,armink/rt-thread,weety/rt-thread,weiyuliang/rt-thread,weiyuliang/rt-thread,geniusgogo/rt-thread,RT-Thread/rt-thread,nongxiaoming/rt-thread,RT-Thread/rt-thread,ArdaFu/rt-thread,hezlog/rt-thread,geniusgogo/rt-thread,nongxiaoming/rt-thread,weiyuliang/rt-thread,armink/rt-thread,weiyuliang/rt-thread,hezlog/rt-thread,armink/rt-thread,ArdaFu/rt-thread,hezlog/rt-thread,geniusgogo/rt-thread,weiyuliang/rt-thread,weety/rt-thread,weiyuliang/rt-thread,ArdaFu/rt-thread,nongxiaoming/rt-thread,ArdaFu/rt-thread,ArdaFu/rt-thread,nongxiaoming/rt-thread,weiyuliang/rt-thread,weety/rt-thread,nongxiaoming/rt-thread,RT-Thread/rt-thread,armink/rt-thread,nongxiaoming/rt-thread,geniusgogo/rt-thread,geniusgogo/rt-thread,RT-Thread/rt-thread,hezlog/rt-thread,weety/rt-thread,ArdaFu/rt-thread,armink/rt-thread,hezlog/rt-thread,RT-Thread/rt-thread,weety/rt-thread,weety/rt-thread,geniusgogo/rt-thread,RT-Thread/rt-thread,armink/rt-thread,hezlog/rt-thread,weety/rt-thread,RT-Thread/rt-thread,nongxiaoming/rt-thread,geniusgogo/rt-thread,hezlog/rt-thread,armink/rt-thread