[media] cx18: fix kernel oops when setting MPEG control before capturing

The cxhdl->priv field was not set initially, only after capturing started.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Acked-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-driver.c

@@ -734,6 +734,7 @@ static int __devinit cx18_init_struct1(struct cx18 *cx)
 	cx->cxhdl.capabilities = CX2341X_CAP_HAS_TS | CX2341X_CAP_HAS_SLICED_VBI;
 	cx->cxhdl.ops = &cx18_cxhdl_ops;
 	cx->cxhdl.func = cx18_api_func;
+	cx->cxhdl.priv = &cx->streams[CX18_ENC_STREAM_TYPE_MPG];
 	ret = cx2341x_handler_init(&cx->cxhdl, 50);
 	if (ret)
 		return ret;