drivers/gpu/drm: Remove unnecessary casts of private_data

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
index 8312328..1e8eedd 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
@@ -39,7 +39,7 @@
 		return drm_mmap(filp, vma);
 	}
 
-	file_priv = (struct drm_file *)filp->private_data;
+	file_priv = filp->private_data;
 	dev_priv = vmw_priv(file_priv->minor->dev);
 	return ttm_bo_mmap(filp, vma, &dev_priv->bdev);
 }