sched/fair: Cleanup pick_task_fair()'s curr

With 4c456c9a ("sched/fair: Remove unused 'curr' argument from
pick_next_entity()") curr is no longer being used, so no point in
clearing it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Tested-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lkml.kernel.org/r/20240727105028.614707623@infradead.org

kernel/sched/fair.c

@@ -8463,15 +8463,9 @@ static struct task_struct *pick_task_fair(struct rq *rq)
 		return NULL;
 
 	do {
-		struct sched_entity *curr = cfs_rq->curr;
-
 		/* When we pick for a remote RQ, we'll not have done put_prev_entity() */
-		if (curr) {
-			if (curr->on_rq)
-				update_curr(cfs_rq);
-			else
-				curr = NULL;
-		}
+		if (cfs_rq->curr && cfs_rq->curr->on_rq)
+			update_curr(cfs_rq);
 
 		if (unlikely(check_cfs_rq_runtime(cfs_rq)))
 			goto again;