vmwgfx: don't use flush_scheduled_work()

flush_scheduled_work() is deprecated and scheduled to be removed.
Directly flush info->deferred_work on removal instead.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
index 41d9a5b..fe096a7 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -659,7 +659,7 @@
 	par->dirty.active = false;
 	spin_unlock_irqrestore(&par->dirty.lock, flags);
 
-	flush_scheduled_work();
+	flush_delayed_work_sync(&info->deferred_work);
 
 	par->bo_ptr = NULL;
 	ttm_bo_kunmap(&par->map);