staging: vboxvideo: Fix IRQs no longer working

Commit 1daddbc8 ("staging: vboxvideo: Update driver to use
drm_dev_register.") replaced the obsolere drm_get_pci_dev() with
normal pci probe and remove functions.

But the new vbox_pci_probe() is missing a pci_enable_device() call,
causing interrupts to not be delivered. This causes resizes of the
vm window to not get seen by the drm/kms code.

This commit adds the missing pci_enable_device() call, fixing this.

Fixes: 1daddbc8 ("staging: vboxvideo: Update driver to use ...")
Cc: Fabio Rafael da Rosa <fdr@pid42.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Nicholas Mc Guire <der.herr@hofr.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vboxvideo/vbox_drv.c

@@ -59,6 +59,11 @@ static int vbox_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		ret = PTR_ERR(dev);
 		goto err_drv_alloc;
 	}
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		goto err_pci_enable;
+
 	dev->pdev = pdev;
 	pci_set_drvdata(pdev, dev);
 
@@ -75,6 +80,8 @@ static int vbox_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  err_drv_dev_register:
 	vbox_driver_unload(dev);
  err_vbox_driver_load:
+	pci_disable_device(pdev);
+ err_pci_enable:
 	drm_dev_put(dev);
  err_drv_alloc:
 	return ret;