nwflash: use simple_read_from_buffer()

static ssize_t flash_read(struct file *file, char __user *buf, size_t size,

			  loff_t *ppos)

{

	unsigned long p = *ppos;

	unsigned int count = size;

	int ret = 0;

	ssize_t ret;

	if (flashdebug)

		printk(KERN_DEBUG "flash_read: flash_read: offset=0x%lX, "

		       "buffer=%p, count=0x%X.\n", p, buf, count);

	if (count)

		ret = -ENXIO;

	if (p < gbFlashSize) {

		if (count > gbFlashSize - p)

			count = gbFlashSize - p;

	/*

	 * We now lock against reads and writes. --rmk

	 */

	if (mutex_lock_interruptible(&nwflash_mutex))

		return -ERESTARTSYS;

		ret = copy_to_user(buf, (void *)(FLASH_BASE + p), count);

		if (ret == 0) {

			ret = count;

			*ppos += count;

		} else

			ret = -EFAULT;

	ret = simple_read_from_buffer(buf, size, ppos, FLASH_BASE, gbFlashSize);

	mutex_unlock(&nwflash_mutex);

	}

	return ret;

}