Fix incorrect condition for checking password related check

Commit db48cea chagned logic to move logic from a variable and repeated
checks to an if clause.

The old code had

            const bool ccnr = (options->auth_user_pass_verify_script
                                || PLUGIN_OPTION_LIST(options)
                                || MAN_CLIENT_AUTH_ENABLED(options));

followed by several condition that checked !ccnr

This commit fixes the if clause by correctly applying De Morgan's law.

Github: closes #706

Change-Id: I28a8abd0ee3fa9168a716171b0a405476089c4a1
Signed-off-by: Arne Schwabe <[email protected]>
Acked-by: Antonio Quartulli <[email protected]>
Message-Id: <[email protected]>
URL: https://sourceforge.net/p/openvpn/mailman/message/59164222/
URL: http://gerrit.openvpn.net/c/openvpn/+/912
Signed-off-by: Gert Doering <[email protected]>

Author: schwabe

src/openvpn/options.c

@@ -2752,8 +2752,8 @@ options_postprocess_verify_ce(const struct options *options,
 
         }
         if (!options->auth_user_pass_verify_script
-            || PLUGIN_OPTION_LIST(options)
-            || MAN_CLIENT_AUTH_ENABLED(options))
+            && !PLUGIN_OPTION_LIST(options)
+            && !MAN_CLIENT_AUTH_ENABLED(options))
         {
             const char *use_err = "--%s must be used with --management-client-auth, an --auth-user-pass-verify script, or plugin";