crypto: ux500 - Remove set but not used variable 'cookie'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/crypto/ux500/hash/hash_core.c: In function hash_set_dma_transfer:
drivers/crypto/ux500/hash/hash_core.c:143:15: warning: variable cookie set but not used [-Wunused-but-set-variable]

It is not used since commit 8a63b199 ("crypto:
ux500 - Add driver for HASH hardware")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ux500/hash/hash_core.c

@@ -140,7 +140,6 @@ static int hash_set_dma_transfer(struct hash_ctx *ctx, struct scatterlist *sg,
 {
 	struct dma_async_tx_descriptor *desc = NULL;
 	struct dma_chan *channel = NULL;
-	dma_cookie_t cookie;
 
 	if (direction != DMA_TO_DEVICE) {
 		dev_err(ctx->device->dev, "%s: Invalid DMA direction\n",
@@ -176,7 +175,7 @@ static int hash_set_dma_transfer(struct hash_ctx *ctx, struct scatterlist *sg,
 	desc->callback = hash_dma_callback;
 	desc->callback_param = ctx;
 
-	cookie = dmaengine_submit(desc);
+	dmaengine_submit(desc);
 	dma_async_issue_pending(channel);
 
 	return 0;