drm/qxl: Use dev_get_drvdata where possible

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.
Signed-off-by: NChuhong Yuan <hslester96@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190723103959.4078-1-hslester96@gmail.comSigned-off-by: NGerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/qxl/qxl_drv.c

@@ -210,16 +210,14 @@ static int qxl_pm_resume(struct device *dev)
 
 static int qxl_pm_thaw(struct device *dev)
 {
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct drm_device *drm_dev = pci_get_drvdata(pdev);
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
 
 	return qxl_drm_resume(drm_dev, true);
 }
 
 static int qxl_pm_freeze(struct device *dev)
 {
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct drm_device *drm_dev = pci_get_drvdata(pdev);
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
 
 	return qxl_drm_freeze(drm_dev);
 }