[PATCH, FIXED] drm/vmwgfx: always use ttm_bo_is_reserved

[Maarten Lankhorst]

This was missed during the initial conversion, most likely due to the 
refactoring here.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
---
Woops, forgot to stg refresh before sending, fixed. :-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c 
b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 93dffe3..ddc8db8 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -939,13 +939,13 @@ void vmw_resource_unreserve(struct vmw_resource *res,
        if (new_backup && new_backup != res->backup) {

                if (res->backup) {
-                       BUG_ON(atomic_read(&res->backup->base.reserved) == 0);
+                       BUG_ON(!ttm_bo_is_reserved(&res->backup->base));
                        list_del_init(&res->mob_head);
                        vmw_dmabuf_unreference(&res->backup);
                }

                res->backup = vmw_dmabuf_reference(new_backup);
-               BUG_ON(atomic_read(&new_backup->base.reserved) == 0);
+               BUG_ON(!ttm_bo_is_reserved(&new_backup->base));
                list_add_tail(&res->mob_head, &new_backup->res_list);
        }
        if (new_backup)