Cygwin: utils: chattr: do not default to CWD

Drop the unexpected behaviour to run chattr in the CWD if no file has
been specified on the command line.  Bail out with usage info instead.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/utils/chattr.c

@@ -320,12 +320,9 @@ next:
   if (sanity_check ())
     return 1;
   if (optind > argc - 1)
-    {
-      chattr (".");
-      if (Ropt)
-	chattr_dir (".");
-    }
-  else for (; optind < argc; ++optind)
+    usage (stderr);
+
+  for (; optind < argc; ++optind)
     {
       struct stat st;