If authdial fails, try with what we know.
suggested by rsc.

Reference: /n/sources/patch/applied/factotum-cs-fix
Date: Tue Nov 29 20:29:11 CET 2005

--- /sys/src/cmd/auth/factotum/util.c	Tue Nov 29 20:28:54 2005
+++ /sys/src/cmd/auth/factotum/util.c	Tue Nov 29 20:28:51 2005
@@ -27,11 +27,15 @@
 {
 	int fd;
 	int vanilla;
+	int r;
 
 	vanilla = net==nil || strcmp(net, "/net")==0;
 
-	if(!vanilla || bindnetcs()>=0)
-		return authdial(net, authdom);
+	if(!vanilla || bindnetcs()>=0){
+		r = authdial(net, authdom);
+		if(r >= 0)
+			return r;
+	}
 
 	/* use the auth sever passed to us as an arg */
 	if(authaddr == nil)