ITS#9534 fix delta-sync startup

When transitioning from plain refresh to delta mode, don't
wait for a reschedule, go immediately.
Partially reverts f2740c79

servers/slapd/syncrepl.c

@@ -1900,6 +1900,8 @@ done:
 	if ( msg ) ldap_msgfree( msg );
 
 	if ( rc ) {
+		if ( rc == LDAP_SYNC_REFRESH_REQUIRED && si->si_logstate == SYNCLOG_LOGGING && si->si_ld )
+			return rc;
 		/* never reuse existing connection */
 		if ( si->si_conn ) {
 			connection_client_stop( si->si_conn );
@@ -2044,6 +2046,7 @@ do_syncrepl(
 		rc = do_syncrep1( op, si );
 	}
 
+reload:
 	/* Process results */
 	if ( rc == LDAP_SUCCESS ) {
 		ldap_get_option( si->si_ld, LDAP_OPT_DESC, &s );
@@ -2065,6 +2068,14 @@ do_syncrepl(
 		op->o_ndn = op->o_bd->be_rootndn;
 		rc = do_syncrep2( op, si );
 		if ( rc == LDAP_SYNC_REFRESH_REQUIRED )	{
+			if ( si->si_logstate == SYNCLOG_LOGGING ) {
+				if ( BER_BVISNULL( &si->si_syncCookie.octet_str ))
+					slap_compose_sync_cookie( NULL, &si->si_syncCookie.octet_str,
+						si->si_syncCookie.ctxcsn, si->si_syncCookie.rid,
+						si->si_syncCookie.sid, NULL );
+				rc = ldap_sync_search( si, op->o_tmpmemctx );
+				goto reload;
+			}
 			/* give up but schedule an immedite retry */
 			rc = SYNC_PAUSED;
 		}