psi: Remove repeated verbose comment

Comment in function psi_task_switch,there are two same lines.
...
* runtime state, the cgroup that contains both tasks
* runtime state, the cgroup that contains both tasks
...
Signed-off-by: Liu Xinpeng <liuxp11@chinatelecom.cn>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lore.kernel.org/r/1635133586-84611-1-git-send-email-liuxp11@chinatelecom.cn

kernel/sched/psi.c

@@ -833,7 +833,6 @@ void psi_task_switch(struct task_struct *prev, struct task_struct *next,
 		/*
 		 * When switching between tasks that have an identical
 		 * runtime state, the cgroup that contains both tasks
-		 * runtime state, the cgroup that contains both tasks
 		 * we reach the first common ancestor. Iterate @next's
 		 * ancestors only until we encounter @prev's ONCPU.
 		 */