media: dvb-frontends/cxd2099: Make en_templ constant

Static structure en_templ, of type dvb_ca_en50221, is not used except to
be copied into a local variable. Hence make it const to prevent
unintended modification of the original fields.
Issue found with Coccinelle.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/dvb-frontends/cxd2099.c

@@ -594,7 +594,7 @@ static int write_data(struct dvb_ca_en50221 *ca, int slot, u8 *ebuf, int ecount)
 	return ecount;
 }
 
-static struct dvb_ca_en50221 en_templ = {
+static const struct dvb_ca_en50221 en_templ = {
 	.read_attribute_mem  = read_attribute_mem,
 	.write_attribute_mem = write_attribute_mem,
 	.read_cam_control    = read_cam_control,