ossl_print_attribute_value(): Multiple minor fixes for style and other errors

ossl_print_attribute_value(): Multiple minor fixes for style and other errors

- use correct return values
- do not modify pointer in the atrtribute after decoding with d2i_X509_NAME()
- make oid parameter const in print_oid
- use OPENSSL_buf2hexstr_ex
- simplify return code translation from BIO_printf()

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24725)