Revert "asn1/tasn_utl.c: fix logical error in and overhaul asn1_do_lock."

This reverts commit 24233a0f

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Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/6843)