sched: bugfix setscheduler unlock cpuset_rwsem

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4BUSF


CVE: NA

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Signed-off-by: Zheng Zucheng <zhengzucheng@huawei.com>
Reviewed-by: Chen Hui <judy.chenhui@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>