printf("Usage: %s [-s startup command]\n", argv[0]);
			return EXIT_FAILURE;

			goto usage;

	if (optind < argc) {
		printf("Usage: %s [-s startup command]\n", argv[0]);
		return EXIT_FAILURE;
	}

	if (optind < argc)
		goto usage;

usage:
	printf("Usage: %s [-qvd] [-s startup command]\n", argv[0]);
	return EXIT_FAILURE;

More/less verbose output can be requested with flags as well:
* `-q`: quiet (log level WLR_SILENT)
* `-v`: verbose (log level WLR_INFO)
* `-d`: debug (log level WLR_DEBUG)