vfio/cpr.c: use QOM casts where appropriate

Use QOM casts to convert between VFIOPCIDevice and PCIDevice instead of
accessing pdev directly.

Signed-off-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>
Reviewed-by: Steve Sistare <steven.sistare@oracle.com>
Link: https://lore.kernel.org/qemu-devel/20250715093110.107317-19-mark.caveayland@nutanix.com
[ clg: Updated vfio_cpr_set_msi_virq() ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
diff --git a/hw/vfio/cpr.c b/hw/vfio/cpr.c
index a831243..f911988 100644
--- a/hw/vfio/cpr.c
+++ b/hw/vfio/cpr.c
@@ -56,7 +56,7 @@
 {
     int i, fd;
     bool pending = false;
-    PCIDevice *pdev = &vdev->pdev;
+    PCIDevice *pdev = PCI_DEVICE(vdev);
 
     vdev->nr_vectors = nr_vectors;
     vdev->msi_vectors = g_new0(VFIOMSIVector, nr_vectors);
@@ -99,7 +99,7 @@
 static int vfio_cpr_pci_pre_load(void *opaque)
 {
     VFIOPCIDevice *vdev = opaque;
-    PCIDevice *pdev = &vdev->pdev;
+    PCIDevice *pdev = PCI_DEVICE(vdev);
     int size = MIN(pci_config_size(pdev), vdev->config_size);
     int i;
 
@@ -113,7 +113,7 @@
 static int vfio_cpr_pci_post_load(void *opaque, int version_id)
 {
     VFIOPCIDevice *vdev = opaque;
-    PCIDevice *pdev = &vdev->pdev;
+    PCIDevice *pdev = PCI_DEVICE(vdev);
     int nr_vectors;
 
     vfio_sub_page_bar_update_mappings(vdev);
@@ -214,7 +214,7 @@
 static int vfio_cpr_set_msi_virq(VFIOPCIDevice *vdev, Error **errp, bool enable)
 {
     const char *op = (enable ? "enable" : "disable");
-    PCIDevice *pdev = &vdev->pdev;
+    PCIDevice *pdev = PCI_DEVICE(vdev);
     int i, nr_vectors, ret = 0;
 
     if (msix_enabled(pdev)) {