drm/bochs: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190723101103.30250-1-hslester96@gmail.comSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/bochs/bochs_drv.c

@@ -80,16 +80,14 @@ static struct drm_driver bochs_driver = {
 #ifdef CONFIG_PM_SLEEP
 static int bochs_pm_suspend(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 drm_mode_config_helper_suspend(drm_dev);
 }
 
 static int bochs_pm_resume(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 drm_mode_config_helper_resume(drm_dev);
 }