V4L/DVB (11255): dst_ca: fix compile warning.

static long dst_ca_ioctl(struct file *file, unsigned int cmd, unsigned long ioctl_arg)

{

	lock_kernel();

	struct dvb_device* dvbdev = (struct dvb_device*) file->private_data;

	struct dst_state* state = (struct dst_state*) dvbdev->priv;

	struct dvb_device *dvbdev;

	struct dst_state *state;

	struct ca_slot_info *p_ca_slot_info;

	struct ca_caps *p_ca_caps;

	struct ca_msg *p_ca_message;

	void __user *arg = (void __user *)ioctl_arg;

	int result = 0;

	lock_kernel();

	dvbdev = (struct dvb_device *)file->private_data;

	state = (struct dst_state *)dvbdev->priv;

	p_ca_message = kmalloc(sizeof (struct ca_msg), GFP_KERNEL);

	p_ca_slot_info = kmalloc(sizeof (struct ca_slot_info), GFP_KERNEL);

	p_ca_caps = kmalloc(sizeof (struct ca_caps), GFP_KERNEL);