dmaengine: ti: omap-dma: Remove variable override in omap_dma_tx_status()

There is no need to fetch local omap_desc since the desc we have is the
correct one already when we need to check the channel status.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20190730132029.2971-1-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/ti/omap-dma.c

@@ -860,7 +860,6 @@ out:
 		 * accordingly and mark it as completed
 		 */
 		if (!(ccr & CCR_ENABLE)) {
-			struct omap_desc *d = c->desc;
 			ret = DMA_COMPLETE;
 			omap_dma_start_desc(c);
 			vchan_cookie_complete(&d->vd);