dmaengine: dw-edma: Remove an unused variable

'head' is unused, remove it.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/46e071be21fbc5ac5c35d4796a7e4249e94c3a77.1633847306.git.christophe.jaillet@wanadoo.frSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/dw-edma/dw-edma-core.c

@@ -249,7 +249,6 @@ static int dw_edma_device_terminate_all(struct dma_chan *dchan)
 {
 	struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);
 	int err = 0;
-	LIST_HEAD(head);
 
 	if (!chan->configured) {
 		/* Do nothing */