[SCSI] ipr: use memory_read_from_buffer()

	struct Scsi_Host *shost = class_to_shost(dev);

	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;

	unsigned long lock_flags = 0;

	int size = IPR_TRACE_SIZE;

	char *src = (char *)ioa_cfg->trace;

	if (off > size)

		return 0;

	if (off + count > size) {

		size -= off;

		count = size;

	}

	ssize_t ret;

	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

	memcpy(buf, &src[off], count);

	ret = memory_read_from_buffer(buf, count, &off, ioa_cfg->trace,

				IPR_TRACE_SIZE);

	spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

	return count;

	return ret;

}

static struct bin_attribute ipr_trace_attr = {