do not return success; frontend already does (ITS#4122)

servers/slapd/back-meta/bind.c

@@ -80,7 +80,7 @@ meta_back_bind( Operation *op, SlapReply *rs )
 		if ( META_BACK_DEFER_ROOTDN_BIND( mi ) ) {
 			rs->sr_err = LDAP_SUCCESS;
 			rs->sr_text = NULL;
-			send_ldap_result( op, rs );
+			/* frontend will return success */
 			return rs->sr_err;
 		}