sched/fair: Use __schedstat_set() in set_next_entity()

[ Upstream commit a2dcb276 ]

schedstat_enabled() has been already checked, so we can use
__schedstat_set() directly.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Link: https://lore.kernel.org/r/20210905143547.4668-2-laoar.shao@gmail.com


Stable-dep-of: 39afe5d6 ("sched/fair: Fix inaccurate tally of ttwu_move_affine")
Signed-off-by: Sasha Levin <sashal@kernel.org>