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libauth: don't attempt to mount when opening mount srv file fails in nsop()

making newnsdebug error messages more usefull...

--- a/sys/src/libauth/newns.c

+++ b/sys/src/libauth/newns.c

@@ -152,7 +152,7 @@

 	cdroot = 0;

 	flags = 0;

 	argv0 = 0;

-	if (newnsdebug){

+	if(newnsdebug){

 		for (i = 0; i < argc; i++)

 			fprint(2, "%s ", argv[i]);

 		fprint(2, "\n");

@@ -181,9 +181,9 @@

 			return 0;

 		cdroot |= nsfile(fn, b, rpc);

 		Bterm(b);

-	}else if(strcmp(argv0, "clear") == 0 && argc == 0)

+	}else if(strcmp(argv0, "clear") == 0 && argc == 0){

 		rfork(RFCNAMEG);

-	else if(strcmp(argv0, "bind") == 0 && argc == 2){

+	}else if(strcmp(argv0, "bind") == 0 && argc == 2){

 		if(bind(argv[0], argv[1], flags) < 0 && newnsdebug)

 			fprint(2, "%s: bind: %s %s: %r\n", fn, argv[0], argv[1]);

 	}else if(strcmp(argv0, "unmount") == 0){

@@ -193,6 +193,11 @@

 			unmount(argv[0], argv[1]);

 	}else if(strcmp(argv0, "mount") == 0){

 		fd = open(argv[0], ORDWR);

+		if(fd < 0){

+			if(newnsdebug)

+				fprint(2, "%s: mount: %s: %r\n", fn, argv[0]);

+			return 0;

+		}

 		if(argc == 2){

 			if(famount(fd, rpc, argv[1], flags, "") < 0 && newnsdebug)

 				fprint(2, "%s: mount: %s %s: %r\n", fn, argv[0], argv[1]);