sched/fair: Move call to list_last_entry() in detach_tasks

Move the call to list_last_entry() in detach_tasks() after testing
loop_max and loop_break.
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220825122726.20819-4-vincent.guittot@linaro.org

kernel/sched/fair.c

@@ -8044,8 +8044,6 @@ static int detach_tasks(struct lb_env *env)
 		if (env->idle != CPU_NOT_IDLE && env->src_rq->nr_running <= 1)
 			break;
 
-		p = list_last_entry(tasks, struct task_struct, se.group_node);
-
 		env->loop++;
 		/*
 		 * We've more or less seen every task there is, call it quits
@@ -8062,6 +8060,8 @@ static int detach_tasks(struct lb_env *env)
 			break;
 		}
 
+		p = list_last_entry(tasks, struct task_struct, se.group_node);
+
 		if (!can_migrate_task(p, env))
 			goto next;