um: switch line_config() to setup_one_line()

{

	struct line *line;

	char *new;

	int n;

	char *end;

	int n, err;

	if (*str == '=') {

		*error_out = "Can't configure all devices from mconsole";

		return -EINVAL;

	}

	new = kstrdup(str, GFP_KERNEL);

	n = simple_strtoul(str, &end, 0);

	if (*end++ != '=') {

		*error_out = "Couldn't parse device number";

		return -EINVAL;

	}

	if (n >= num) {

		*error_out = "Device number out of range";

		return -EINVAL;

	}

	new = kstrdup(end, GFP_KERNEL);

	if (new == NULL) {

		*error_out = "Failed to allocate memory";

		return -ENOMEM;

	}

	n = line_setup(lines, num, new, error_out);

	if (n < 0)

		return n;

	err = setup_one_line(lines, n, new, INIT_ONE, error_out);

	if (err)

		return err;

	line = &lines[n];

	return parse_chan_pair(line->init_str, line, n, opts, error_out);

}