virtio_pci: simplify vp_request_msix_vectors() call a bit

Pass desc arg as it is always to vp_request_msix_vectors(). There rely
on per_vq_vectors arg and null desc in case it is false.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Message-Id: <20240716113552.80599-3-jiri@resnulli.us>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Author: Jiri Pirko

drivers/virtio/virtio_pci_common.c

@@ -125,6 +125,9 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
 					GFP_KERNEL))
 			goto error;
 
+	if (!per_vq_vectors)
+		desc = NULL;
+
 	if (desc) {
 		flags |= PCI_IRQ_AFFINITY;
 		desc->pre_vectors++; /* virtio config vector */
@@ -349,8 +352,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
 		nvectors = 2;
 	}
 
-	err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors,
-				      per_vq_vectors ? desc : NULL);
+	err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors, desc);
 	if (err)
 		goto error_find;