virtio: fix off by one device id comparison

VIRTIO_ID_MAX_NUM is the largest device ID plus 1. Therefore a device id
cannot be greater or equal to VIRTIO_ID_MAX_NUM. Fix the comparison
accordingly.

Fixes: 8fb49b4c ("dm: Add a new uclass driver for VirtIO transport devices")
Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>

drivers/virtio/virtio-uclass.c

@@ -227,7 +227,7 @@ static int virtio_uclass_post_probe(struct udevice *udev)
 	struct udevice *vdev;
 	int ret;
 
-	if (uc_priv->device > VIRTIO_ID_MAX_NUM) {
+	if (uc_priv->device >= VIRTIO_ID_MAX_NUM) {
 		debug("(%s): virtio device ID %d exceeds maximum num\n",
 		      udev->name, uc_priv->device);
 		return 0;