x_attrib: fix a memory leak

The X509_NAME object needs to be free'd even if printing it fails.

Introduced in be5adfd6 ("Support subjectDirectoryAttributes and
associatedInformation exts", 2024-06-18), but subsequently moved in
7bcfb414 ("ossl_print_attribute_value(): use a sequence value only if
type is a sequence", 2024-08-05).

Signed-off-by: Beat Bolli <dev@drbeat.li>

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25207)