sched/fair: Fix a comment in task_numa_fault()

Duplicated 'case it'.

Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
Reviewed-by: Xi Xu <xu.xi8@zte.com.cn>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: zhong.weidong@zte.com.cn
Link: http://lkml.kernel.org/r/1541379013-11352-1-git-send-email-wang.yi59@zte.com.cn
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/fair.c

@@ -2400,8 +2400,8 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags)
 		local = 1;
 
 	/*
-	 * Retry task to preferred node migration periodically, in case it
-	 * case it previously failed, or the scheduler moved us.
+	 * Retry to migrate task to preferred node periodically, in case it
+	 * previously failed, or the scheduler moved us.
 	 */
 	if (time_after(jiffies, p->numa_migrate_retry)) {
 		task_numa_placement(p);