Unlock new_cached_query->rwlock before destroying it.

Fixes rev 1.210 (new since last OpenLDAP release).

servers/slapd/overlays/pcache.c

@@ -1601,6 +1601,8 @@ add_query(
 		templ->no_of_queries++;
 	} else {
 		ldap_pvt_thread_mutex_destroy(&new_cached_query->answerable_cnt_mutex);
+		if (wlock)
+			ldap_pvt_thread_rdwr_wunlock(&new_cached_query->rwlock);
 		ldap_pvt_thread_rdwr_destroy( &new_cached_query->rwlock );
 		ch_free( new_cached_query );
 		new_cached_query = find_filter( op, qbase->scopes[query->scope],