drm/sis: Remove references to struct drm_device.pdev

Replace all references to struct drm_device's pdev field with
an upcast from dev.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210502104953.21768-6-tzimmermann@suse.de

drivers/gpu/drm/sis/sis_drv.c

@@ -41,9 +41,10 @@ static struct pci_device_id pciidlist[] = {
 
 static int sis_driver_load(struct drm_device *dev, unsigned long chipset)
 {
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	drm_sis_private_t *dev_priv;
 
-	pci_set_master(dev->pdev);
+	pci_set_master(pdev);
 
 	dev_priv = kzalloc(sizeof(drm_sis_private_t), GFP_KERNEL);
 	if (dev_priv == NULL)