asn1: clear error mark on success in asn1_d2i_read_bio

asn1: clear error mark on success in asn1_d2i_read_bio

Balance ERR_set_mark by calling ERR_clear_last_mark on the success path.
Prevents a stale mark from skewing later error handling.

Signed-off-by: Joshua Rogers <MegaManSec@users.noreply.github.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28882)