iomap: remove the length variable in iomap_seek_data

iomap_seek_data(struct inode *inode, loff_t offset, const struct iomap_ops *ops)

{

	loff_t size = i_size_read(inode);

	loff_t length = size - offset;

	loff_t ret;

	/* Nothing to be found before or beyond the end of the file. */

	if (offset < 0 || offset >= size)

		return -ENXIO;

	while (length > 0) {

		ret = iomap_apply(inode, offset, length, IOMAP_REPORT, ops,

				  &offset, iomap_seek_data_actor);

	while (offset < size) {

		ret = iomap_apply(inode, offset, size - offset, IOMAP_REPORT,

				  ops, &offset, iomap_seek_data_actor);

		if (ret < 0)

			return ret;

		if (ret == 0)

			break;

			return offset;

		offset += ret;

		length -= ret;

	}

	if (length <= 0)

	/* We've reached the end of the file without finding data */

	return -ENXIO;

	return offset;

}

EXPORT_SYMBOL_GPL(iomap_seek_data);