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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/ti/omap-dma.c

···
 		 * 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);