x509: fix double locking problem

This reverts commit 9aa4be6 and removed the
redundant flag setting.

Fixes #19643

Fixes LOW CVE-2022-3996

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #19652)

(cherry picked from commit 4d0340a)

Author: paulidale

crypto/x509/pcy_map.c

@@ -73,10 +73,6 @@ int ossl_policy_cache_set_mapping(X509 *x, POLICY_MAPPINGS *maps)
 
     ret = 1;
  bad_mapping:
-    if (ret == -1 && CRYPTO_THREAD_write_lock(x->lock)) {
-        x->ex_flags |= EXFLAG_INVALID_POLICY;
-        CRYPTO_THREAD_unlock(x->lock);
-    }
     sk_POLICY_MAPPING_pop_free(maps, POLICY_MAPPING_free);
     return ret;