atm: switch do_atmif_sioc() to direct use of atm_dev_ioctl()

static int do_atmif_sioc(struct socket *sock, unsigned int cmd,

			 unsigned long arg)

{

	struct atmif_sioc __user *sioc;

	struct compat_atmif_sioc __user *sioc32;

	struct compat_atmif_sioc __user *sioc32 = compat_ptr(arg);

	int number;

	u32 data;

	void __user *datap;

	int err;

	sioc = compat_alloc_user_space(sizeof(*sioc));

	sioc32 = compat_ptr(arg);

	if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) ||

	    get_user(data, &sioc32->arg))

		return -EFAULT;

	datap = compat_ptr(data);

	if (put_user(datap, &sioc->arg))

	if (get_user(data, &sioc32->arg) || get_user(number, &sioc32->number))

		return -EFAULT;

	err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);

	if (!err) {

		if (copy_in_user(&sioc32->length, &sioc->length,

				 sizeof(int)))

			err = -EFAULT;

	}

	return err;

	return atm_dev_ioctl(cmd, compat_ptr(data), &sioc32->length, number, 0);

}

static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,