apps/passwd.c: Fix code layout

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/4229)

apps/passwd.c

@@ -152,9 +152,11 @@ int passwd_main(int argc, char **argv)
             mode = passwd_aixmd5;
             break;
         case OPT_CRYPT:
+#ifndef OPENSSL_NO_DES
             if (mode != passwd_unset)
                 goto opthelp;
             mode = passwd_crypt;
+#endif
             break;
         case OPT_SALT:
             passed_salt = 1;