Fix error handling in OBJ_add_object

This fixes the possible memory leak in OBJ_add_object
when a pre-existing object is replaced by a new one,
with identical NID, OID, and/or short/long name.
We do not try to delete any orphans, but only mark
them as type == -1, because the previously returned
pointers from OBJ_nid2obj/OBJ_nid2sn/OBJ_nid2ln
may be cached by applications and can thus not
be cleaned up before the application terminates.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22534)