Try to help how to use this command.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@20069 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/hx509/hxtool.c

@@ -53,6 +53,7 @@ static void
 usage(int code)
 {
     arg_printusage(args, num_args, NULL, "command");
+    printf("Use \"%s help\" to get more help\n", getprogname());
     exit(code);
 }