crypto: hifn_795x - use cancel_delayed_work_sync()

Make hifn_795x::hifn_remove() call cancel_delayed_work_sync() instead
of calling cancel_delayed_work() followed by flush_scheduled_work().

This is to prepare for the deprecation and removal of
flush_scheduled_work().
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/hifn_795x.c

@@ -2700,8 +2700,7 @@ static void __devexit hifn_remove(struct pci_dev *pdev)
 	dev = pci_get_drvdata(pdev);
 
 	if (dev) {
-		cancel_delayed_work(&dev->work);
-		flush_scheduled_work();
+		cancel_delayed_work_sync(&dev->work);
 
 		hifn_unregister_rng(dev);
 		hifn_unregister_alg(dev);