[media] constify stv6110x_devctl structure

The stv6110x_devctl structure is never modified, so declare it as
const.

Done with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/dvb-usb/technisat-usb2.c

@@ -512,7 +512,7 @@ static int technisat_usb2_frontend_attach(struct dvb_usb_adapter *a)
 			&a->dev->i2c_adap, STV090x_DEMODULATOR_0);
 
 	if (a->fe_adap[0].fe) {
-		struct stv6110x_devctl *ctl;
+		const struct stv6110x_devctl *ctl;
 
 		ctl = dvb_attach(stv6110x_attach,
 				a->fe_adap[0].fe,