oxenstored: move sd_notify_ready out of main loop

Oxenstored only needs to notify systemd its readiness state once. Move
sd_notify_ready out of main loop.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Dave Scott <dave.scott@eu.citrix.com>
Tested-by: Andrew Cooper <andrew.cooper3@citrix.com>

tools/ocaml/xenstored/xenstored.ml

@@ -428,11 +428,11 @@ let _ =
 		process_domains store cons domains
 		in
 
+	if Systemd.launched_by_systemd () then
+		Systemd.sd_notify_ready ();
 	while not !quit
 	do
 		try
-                        if Systemd.launched_by_systemd() then
-                                Systemd.sd_notify_ready ();
 			main_loop ()
 		with exc ->
 			error "caught exception %s" (Printexc.to_string exc);