io_uring: simplify io_sqd_update_thread_idle()

Use a more comprehensible() max instead of hand coding it with ifs in
io_sqd_update_thread_idle().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -6699,11 +6699,8 @@ static void io_sqd_update_thread_idle(struct io_sq_data *sqd)
 	struct io_ring_ctx *ctx;
 	unsigned sq_thread_idle = 0;
 
-	list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
-		if (sq_thread_idle < ctx->sq_thread_idle)
-			sq_thread_idle = ctx->sq_thread_idle;
-	}
-
+	list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
+		sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle);
 	sqd->sq_thread_idle = sq_thread_idle;
 }