[S390] cio: add missing compat ptr conversion

#include <linux/uaccess.h>

#include <linux/miscdevice.h>

#include <asm/compat.h>

#include <asm/cio.h>

#include <asm/chsc.h>

#include <asm/isc.h>

static long chsc_ioctl(struct file *filp, unsigned int cmd,

		       unsigned long arg)

{

	void __user *argp;

	CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);

	if (is_compat_task())

		argp = compat_ptr(arg);

	else

		argp = (void __user *)arg;

	switch (cmd) {

	case CHSC_START:

		return chsc_ioctl_start((void __user *)arg);

		return chsc_ioctl_start(argp);

	case CHSC_INFO_CHANNEL_PATH:

		return chsc_ioctl_info_channel_path((void __user *)arg);

		return chsc_ioctl_info_channel_path(argp);

	case CHSC_INFO_CU:

		return chsc_ioctl_info_cu((void __user *)arg);

		return chsc_ioctl_info_cu(argp);

	case CHSC_INFO_SCH_CU:

		return chsc_ioctl_info_sch_cu((void __user *)arg);

		return chsc_ioctl_info_sch_cu(argp);

	case CHSC_INFO_CI:

		return chsc_ioctl_conf_info((void __user *)arg);

		return chsc_ioctl_conf_info(argp);

	case CHSC_INFO_CCL:

		return chsc_ioctl_conf_comp_list((void __user *)arg);

		return chsc_ioctl_conf_comp_list(argp);

	case CHSC_INFO_CPD:

		return chsc_ioctl_chpd((void __user *)arg);

		return chsc_ioctl_chpd(argp);

	case CHSC_INFO_DCAL:

		return chsc_ioctl_dcal((void __user *)arg);

		return chsc_ioctl_dcal(argp);

	default: /* unknown ioctl number */

		return -ENOIOCTLCMD;

	}