[gnutls-devel] GnuTLS | Workaround for SChannel limitations (!1138)

[Development of GNU's TLS library]

Dmitry Eremin-Solenikov commented on a discussion on lib/ext/signature.c: https://gitlab.com/gnutls/gnutls/merge_requests/1138#note_265479544

> +		else if (cert_algo == GNUTLS_PK_GOST_12_256)
> +			dig = GNUTLS_DIG_STREEBOG_256;
> +		else if (cert_algo == GNUTLS_PK_GOST_12_512)
> +			dig = GNUTLS_DIG_STREEBOG_512;
> +		else
> +			dig = GNUTLS_DIG_SHA1;
> +
> +		ret = gnutls_pk_to_sign(cert_algo, dig);
> +
> +		if (!client_cert && _gnutls_session_sign_algo_enabled(session, ret) < 0)
> +			goto fail;
> +		return ret;
> +	}
> +#endif
> +
>  	if (ret < 0 || !_gnutls_version_has_selectable_sighash(ver)) {

I've changed code to set `priv` to `NULL` if there was no extension present. Then the code can use `if (!priv)` condition.

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