dmaengine: ti: k3-udma: Fix delayed_work usage for tx drain workaround

INIT_DELAYED_WORK_ONSTACK() must be used with on-stack delayed work, which
is not the case here.
Use normal delayed_work for the channels instead.

Fixes: 25dcb5dd ("dmaengine: ti: New driver for K3 UDMA")
Reported-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20200618114004.6268-1-peter.ujfalusi@ti.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/ti/k3-udma.c

@@ -1907,8 +1907,6 @@ static int udma_alloc_chan_resources(struct dma_chan *chan)
 
 	udma_reset_rings(uc);
 
-	INIT_DELAYED_WORK_ONSTACK(&uc->tx_drain.work,
-				  udma_check_tx_completion);
 	return 0;
 
 err_irq_free:
@@ -3020,7 +3018,6 @@ static void udma_free_chan_resources(struct dma_chan *chan)
 	}
 
 	cancel_delayed_work_sync(&uc->tx_drain.work);
-	destroy_delayed_work_on_stack(&uc->tx_drain.work);
 
 	if (uc->irq_num_ring > 0) {
 		free_irq(uc->irq_num_ring, uc);
@@ -3712,6 +3709,7 @@ static int udma_probe(struct platform_device *pdev)
 		tasklet_init(&uc->vc.task, udma_vchan_complete,
 			     (unsigned long)&uc->vc);
 		init_completion(&uc->teardown_completed);
+		INIT_DELAYED_WORK(&uc->tx_drain.work, udma_check_tx_completion);
 	}
 
 	ret = dma_async_device_register(&ud->ddev);