sunrpc: use simple_read_from_buffer for reading cache flush

			  struct cache_detail *cd)

{

	char tbuf[22];

	unsigned long p = *ppos;

	size_t len;

	snprintf(tbuf, sizeof(tbuf), "%lu\n", convert_to_wallclock(cd->flush_time));

	len = strlen(tbuf);

	if (p >= len)

		return 0;

	len -= p;

	if (len > count)

		len = count;

	if (copy_to_user(buf, (void*)(tbuf+p), len))

		return -EFAULT;

	*ppos += len;

	return len;

	len = snprintf(tbuf, sizeof(tbuf), "%lu\n",

			convert_to_wallclock(cd->flush_time));

	return simple_read_from_buffer(buf, count, ppos, tbuf, len);

}

static ssize_t write_flush(struct file *file, const char __user *buf,