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fixed a segfault in auth/as because it didn't check to see if argv[0] and argv[1] actually had things in them

--- a/sys/src/cmd/auth/as.c

+++ b/sys/src/cmd/auth/as.c

@@ -52,7 +52,10 @@

 	initcap();

 	srand(getpid()*time(0));

-	runas(argv[0], argv[1]);

+	if(argc >= 2)

+		runas(argv[0], argv[1]);

+	else

+		usage();

 }

 void

@@ -88,7 +91,7 @@

 void

 usage(void)

 {

-	fprint(2, "usage: %s [-c]\n", argv0);

+	fprint(2, "usage: %s [-c] [user] [command]\n", argv0);

 	exits("usage");

 }

-- 

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