dmaengine: ioat: remove unused ‘res’

In __cleanup(), variable ‘res’ is initialized but never used, which
leads to warning with W=1

drivers/dma/ioat/dma.c: In function ‘__cleanup’:
drivers/dma/ioat/dma.c:614:28: warning: variable ‘res’ set but not used [-Wunused-but-set-variable]
struct dmaengine_result res;

So remove it.

Cc: Dave Jiang <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/ioat/dma.c

···
 
 		tx = &desc->txd;
 		if (tx->cookie) {
-			struct dmaengine_result res;
-
 			dma_cookie_complete(tx);
 			dma_descriptor_unmap(tx);
-			res.result = DMA_TRANS_NOERROR;
 			dmaengine_desc_get_callback_invoke(tx, NULL);
 			tx->callback = NULL;
 			tx->callback_result = NULL;