[gnutls-devel] GnuTLS | Fix gnutls_pkcs11_token_get_info for short output buffers and fix a memleak (!827)

[Development of GNU's TLS library]

Peter Wu commented on a discussion on lib/pkcs11.c:

>  			goto cleanup;
>  		}
>  
> -		snprintf(output, *output_size, "%s", tn.modname);
> -		*output_size = strlen(output);
> -		ret = 0;
> -		goto cleanup;
> +		modname = tn.modname;
> +		if (modname == NULL) {
> +			gnutls_assert();

Code search through Github for `GNUTLS_PKCS11_TOKEN_MODNAME` or https://codesearch.debian.net/search?q=GNUTLS_PKCS11_TOKEN_MODNAME did not show users other than GnuTLS src/pkcs11.c

An empty value is a reasonable value though, so I'll change it anyway.

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