[gnutls-devel] GnuTLS | Cleanup and fixes (!779)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos started a new discussion on lib/cert-cred.c:

>  void
>  gnutls_certificate_free_credentials(gnutls_certificate_credentials_t sc)
>  {
> -	gnutls_x509_trust_list_deinit(sc->tlist, 1);
> -	gnutls_certificate_free_keys(sc);
> -	memset(sc->pin_tmp, 0, sizeof(sc->pin_tmp));
> +	// Check for valid pointer and otherwise do nothing
> +	if (sc != NULL)	{

This is ok, but adding the check on top such as:
```
if (sc == NULL)
        return;
```
Would reduce the number of changes.

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