[gnutls-devel] GnuTLS | x509: drop endless loop in print_extensions (!1205)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos commented on a discussion on lib/x509/output.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1205#note_302587044

>  				break;
>  			addf(str, "error: get_extension_info: %s\n",
>  			     gnutls_strerror(err));
> +			/* After addf to get error message */
> +			if (err == GNUTLS_E_ASN1_DER_ERROR)

This infinite loop construction seems to be used a lot in this file, however only in few cases it can lead to infinite loops.

There are two other identical to this one:
`gnutls_x509_crl_get_extension_info()`
and `gnutls_x509_crq_get_attribute_info()`

Should we handle them similarly? (if you wouldn't like as part of this MR, I can submit another one)

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