crypto: qce - Fix dma_map_sg error check

dma_map_sg return 0 on error, fix the error check and return -EIO to
caller.

Cc: Thara Gopinath <[e-mail]>
Cc: Herbert Xu <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]

Signed-off-by: Jack Wang <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/qce/aead.c

···
 	if (ret)
 		return ret;
 	dst_nents = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
-	if (dst_nents < 0) {
-		ret = dst_nents;
+	if (!dst_nents) {
+		ret = -EIO;
 		goto error_free;
 	}
 

drivers/crypto/qce/sha.c

···
 	}
 
 	ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE);
-	if (ret < 0)
-		return ret;
+	if (!ret)
+		return -EIO;
 
 	sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
 
 	ret = dma_map_sg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE);
-	if (ret < 0)
+	if (!ret) {
+		ret = -EIO;
 		goto error_unmap_src;
+	}
 
 	ret = qce_dma_prep_sgs(&qce->dma, req->src, rctx->src_nents,
 			       &rctx->result_sg, 1, qce_ahash_done, async_req);

drivers/crypto/qce/skcipher.c

···
 	rctx->dst_sg = rctx->dst_tbl.sgl;
 
 	dst_nents = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
-	if (dst_nents < 0) {
-		ret = dst_nents;
+	if (!dst_nents) {
+		ret = -EIO;
 		goto error_free;
 	}
 
 	if (diff_dst) {
 		src_nents = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src);
-		if (src_nents < 0) {
-			ret = src_nents;
+		if (!src_nents) {
+			ret = -EIO;
 			goto error_unmap_dst;
 		}
 		rctx->src_sg = req->src;