Copy update callback across when copying EVP_MD_CTX.

Remove unnecessary reference to EVP_MD_CTX in HMAC pkey method.

crypto/evp/digest.c

@@ -292,6 +292,8 @@ int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 		memcpy(out->md_data,in->md_data,out->digest->ctx_size);
 		}
 
+	out->update = in->update;
+
 	if (in->pctx)
 		{
 		out->pctx = EVP_PKEY_CTX_dup(in->pctx);

crypto/hmac/hm_pmeth.c

@@ -68,7 +68,6 @@
 typedef struct
 	{
 	const EVP_MD *md;	/* MD for HMAC use */
-	EVP_MD_CTX *mctx;	/* Parent EVP_MD_CTX */
 	ASN1_OCTET_STRING ktmp; /* Temp storage for key */
 	HMAC_CTX ctx;
 	} HMAC_PKEY_CTX;
@@ -80,7 +79,6 @@ static int pkey_hmac_init(EVP_PKEY_CTX *ctx)
 	if (!hctx)
 		return 0;
 	hctx->md = NULL;
-	hctx->mctx = NULL;
 	hctx->ktmp.data = NULL;
 	HMAC_CTX_init(&hctx->ctx);
 
@@ -145,8 +143,6 @@ static int int_update(EVP_MD_CTX *ctx,const void *data,size_t count)
 
 static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
 	{
-	HMAC_PKEY_CTX *hctx = ctx->data;
-	hctx->mctx = mctx;
 	EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
 	mctx->update = int_update;
 	return 1;