crypto: ccree - fix a memory leak in cc_mac_digest()

Add cc_unmap_result() if cc_map_hash_request_final()
fails to prevent potential memory leak.

Fixes: 6389381 ("crypto: ccree - add ahash support")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@isrc.iscas.ac.cn>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: Haoxiang Li

drivers/crypto/ccree/cc_hash.c

@@ -1448,6 +1448,7 @@ static int cc_mac_digest(struct ahash_request *req)
 	if (cc_map_hash_request_final(ctx->drvdata, state, req->src,
 				      req->nbytes, 1, flags)) {
 		dev_err(dev, "map_ahash_request_final() failed\n");
+		cc_unmap_result(dev, state, digestsize, req->result);
 		cc_unmap_req(dev, state, ctx);
 		return -ENOMEM;
 	}