drm/hisilicon: Delete unused local parameters

delete unused variable ‘priv’ to avoid warning.
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1607339778-20460-3-git-send-email-tiantao6@hisilicon.com

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -250,12 +250,9 @@ static int hibmc_hw_init(struct hibmc_drm_private *priv)
 
 static int hibmc_unload(struct drm_device *dev)
 {
-	struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
-
 	drm_atomic_helper_shutdown(dev);
-
 	pci_disable_msi(dev->pdev);
-	dev->dev_private = NULL;
+
 	return 0;
 }