ALSA: info: Small refactoring and a sanity check in snd_info_get_line()

{

	int c = -1;

	if (snd_BUG_ON(!buffer || !buffer->buffer))

		return 1;

	if (len <= 0 || buffer->stop || buffer->error)

		return 1;

	while (--len > 0) {

	while (!buffer->stop) {

		c = buffer->buffer[buffer->curr++];

		if (c == '\n') {

		if (buffer->curr >= buffer->size)

			buffer->stop = 1;

		if (c == '\n')

			break;

		}

		if (len) {

			len--;

			*line++ = c;

		if (buffer->curr >= buffer->size) {

			buffer->stop = 1;

			break;

		}

	}

	while (c != '\n' && !buffer->stop) {

		c = buffer->buffer[buffer->curr++];

		if (buffer->curr >= buffer->size)

			buffer->stop = 1;

	}

	*line = '\0';

	return 0;

}