virtio_vdpa: remove redundant check on desc

The boolean variable has_affinity is true when desc is non-null and
ops->set_vq_affinity is non-null. Hence the call to create_affinity_masks
does not need to check for desc being non-null is redundant when
has_affinity is true, so it can be removed as well as the now unused
default_affd.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Message-Id: <20241107132114.22188-1-colin.i.king@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>

drivers/virtio/virtio_vdpa.c

@@ -364,14 +364,13 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
 	const struct vdpa_config_ops *ops = vdpa->config;
-	struct irq_affinity default_affd = { 0 };
 	struct cpumask *masks;
 	struct vdpa_callback cb;
 	bool has_affinity = desc && ops->set_vq_affinity;
 	int i, err, queue_idx = 0;
 
 	if (has_affinity) {
-		masks = create_affinity_masks(nvqs, desc ? desc : &default_affd);
+		masks = create_affinity_masks(nvqs, desc);
 		if (!masks)
 			return -ENOMEM;
 	}