drm/vboxvideo: Use devm_drm_dev_alloc

Straightforward conversion.

Reviewed-by: Hans de Goede <[e-mail]>
Acked-by: Sam Ravnborg <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Cc: Hans de Goede <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/vboxvideo/vbox_drv.c

···
 	if (ret)
 		return ret;
 
-	vbox = kzalloc(sizeof(*vbox), GFP_KERNEL);
-	if (!vbox)
-		return -ENOMEM;
-
-	ret = drm_dev_init(&vbox->ddev, &driver, &pdev->dev);
-	if (ret) {
-		kfree(vbox);
-		return ret;
-	}
+	vbox = devm_drm_dev_alloc(&pdev->dev, &driver,
+				  struct vbox_private, ddev);
+	if (IS_ERR(vbox))
+		return PTR_ERR(vbox);
 
 	vbox->ddev.pdev = pdev;
 	vbox->ddev.dev_private = vbox;
 	pci_set_drvdata(pdev, vbox);
-	drmm_add_final_kfree(&vbox->ddev, vbox);
 	mutex_init(&vbox->hw_mutex);
 
 	ret = pci_enable_device(pdev);
 	if (ret)
-		goto err_dev_put;
+		return ret;
 
 	ret = vbox_hw_init(vbox);
 	if (ret)
···
 	vbox_hw_fini(vbox);
 err_pci_disable:
 	pci_disable_device(pdev);
-err_dev_put:
-	drm_dev_put(&vbox->ddev);
 	return ret;
 }
 
···
 	vbox_mode_fini(vbox);
 	vbox_mm_fini(vbox);
 	vbox_hw_fini(vbox);
-	drm_dev_put(&vbox->ddev);
 }
 
 #ifdef CONFIG_PM_SLEEP