(main): Handle argc < optind.

src/printenv.c

@@ -1,5 +1,5 @@
 /* printenv -- print all or part of environment
-   Copyright (C) 1989-1997, 1999-2002 Free Software Foundation, Inc.
+   Copyright (C) 1989-1997, 1999-2003 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -107,7 +107,7 @@ main (int argc, char **argv)
 	}
     }
 
-  if (optind == argc)
+  if (optind >= argc)
     {
       for (env = environ; *env != NULL; ++env)
 	puts (*env);