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aux/listen: tweak per service namespaces

move in to the namespace earlier before the
announce. Only attempt and complain to syslog
when the file already exists, but if building
the new namespace fails we should bail.

--- a/sys/src/cmd/aux/listen.c

+++ b/sys/src/cmd/aux/listen.c

@@ -149,7 +149,7 @@

 void

 listendir(char *srvdir, int trusted)

 {

-	int ctl, pid, start, i;

+	int ctl, pid, start;

 	char dir[40], err[128], ds[128];

 	char prog[Maxpath], serv[Maxserv], ns[Maxpath];

 	long childs;

@@ -206,6 +206,12 @@

 				syslog(1, listenlog, "couldn't fork for %s", ds);

 				break;

 			case 0:

+				/* optional per service namespace files */

+				if(!trusted && access(ns, AEXIST)==0)

+					if(newns("none", ns) < 0){

+						syslog(1, listenlog, "can't build namespace %s: %r\n", ns);

+						exits("newns");

+					}

 				childs = 0;

 				for(;;){

 					ctl = announce(ds, dir);

@@ -222,9 +228,6 @@

 							exits("ctl");

 					}

 					procsetname("%s %s", dir, ds);

-					if(!trusted)

-						if(newns("none", ns) < 0)

-							syslog(0, listenlog, "can't build namespace %s: %r\n", ns);

 					dolisten(dir, ctl, serv, prog, &childs);

 					close(ctl);

 				}