crypto: chelsio - Fix an error code in chcr_hash_dma_map()

The dma_map_sg() function returns zero on error and positive values on
success.  We want to return -ENOMEM on failure here and zero on success.

Fixes: 2f47d580 ("crypto: chelsio - Move DMA un/mapping to chcr from lld cxgb4 driver")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/chelsio/chcr_algo.c

@@ -2410,7 +2410,7 @@ static inline int chcr_hash_dma_map(struct device *dev,
 	error = dma_map_sg(dev, req->src, sg_nents(req->src),
 			   DMA_TO_DEVICE);
 	if (!error)
-		return error;
+		return -ENOMEM;
 	req_ctx->is_sg_map = 1;
 	return 0;
 }