crypto: sa2ul - Fix inconsistent IS_ERR and PTR_ERR

Fix inconsistent IS_ERR and PTR_ERR in sa_dma_init(). The proper pointer
to be passed as argument to PTR_ERR() is dd->dma_tx.

This bug was detected with the help of Coccinelle.

Fixes: 7694b6ca ("crypto: sa2ul - Add crypto driver")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/sa2ul.c

@@ -2259,7 +2259,7 @@ static int sa_dma_init(struct sa_crypto_data *dd)
 
 	dd->dma_tx = dma_request_chan(dd->dev, "tx");
 	if (IS_ERR(dd->dma_tx)) {
-		if (PTR_ERR(dd->dma_rx1) != -EPROBE_DEFER)
+		if (PTR_ERR(dd->dma_tx) != -EPROBE_DEFER)
 			dev_err(dd->dev, "Unable to request tx DMA channel\n");
 		ret = PTR_ERR(dd->dma_tx);
 		goto err_dma_tx;