binfmt_misc: use simple_read_from_buffer()

#include <linux/namei.h>

#include <linux/mount.h>

#include <linux/syscalls.h>

#include <linux/fs.h>

#include <asm/uaccess.h>

bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)

{

	Node *e = file->f_path.dentry->d_inode->i_private;

	loff_t pos = *ppos;

	ssize_t res;

	char *page;

	int len;

	if (!(page = (char*) __get_free_page(GFP_KERNEL)))

		return -ENOMEM;

	entry_status(e, page);

	len = strlen(page);

	res = -EINVAL;

	if (pos < 0)

		goto out;

	res = 0;

	if (pos >= len)

		goto out;

	if (len < pos + nbytes)

		nbytes = len - pos;

	res = -EFAULT;

	if (copy_to_user(buf, page + pos, nbytes))

		goto out;

	*ppos = pos + nbytes;

	res = nbytes;

out:

	res = simple_read_from_buffer(buf, nbytes, ppos, page, strlen(page));

	free_page((unsigned long) page);

	return res;

}