crypto: qat - fix unmap invalid dma address

'dma_mapping_error' return a negative value if 'dma_addr' is equal to
'DMA_MAPPING_ERROR' not zero, so fix initialization of 'dma_addr'.
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_common/qat_algs.c

@@ -719,7 +719,7 @@ static int qat_alg_sgl_to_bufl(struct qat_crypto_instance *inst,
 	struct qat_alg_buf_list *bufl;
 	struct qat_alg_buf_list *buflout = NULL;
 	dma_addr_t blp;
-	dma_addr_t bloutp = 0;
+	dma_addr_t bloutp;
 	struct scatterlist *sg;
 	size_t sz_out, sz = struct_size(bufl, bufers, n + 1);
 
@@ -731,6 +731,9 @@ static int qat_alg_sgl_to_bufl(struct qat_crypto_instance *inst,
 	if (unlikely(!bufl))
 		return -ENOMEM;
 
+	for_each_sg(sgl, sg, n, i)
+		bufl->bufers[i].addr = DMA_MAPPING_ERROR;
+
 	blp = dma_map_single(dev, bufl, sz, DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, blp)))
 		goto err_in;
@@ -764,10 +767,14 @@ static int qat_alg_sgl_to_bufl(struct qat_crypto_instance *inst,
 				       dev_to_node(&GET_DEV(inst->accel_dev)));
 		if (unlikely(!buflout))
 			goto err_in;
+
+		bufers = buflout->bufers;
+		for_each_sg(sglout, sg, n, i)
+			bufers[i].addr = DMA_MAPPING_ERROR;
+
 		bloutp = dma_map_single(dev, buflout, sz_out, DMA_TO_DEVICE);
 		if (unlikely(dma_mapping_error(dev, bloutp)))
 			goto err_out;
-		bufers = buflout->bufers;
 		for_each_sg(sglout, sg, n, i) {
 			int y = sg_nctr;