ui: Reduce nesting in hmp_change_vnc() slightly

Transform

    if (good) {
        do stuff
    } else {
        handle error
    }

to

    if (!good) {
        handle error
	return;
    }
    do stuff

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230109190321.1056914-15-armbru@redhat.com>
1 file changed