[media] tda18271c2dd: fix support for DVB-C

As reported by Hartmut <e9hack@googlemail.com>:

> A break is missing before the default statement. Delivery systems for DVB-C result always
> in an error.
Reported-by: Hartmut <e9hack@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/tda18271c2dd.c

@@ -1159,6 +1159,7 @@ static int set_params(struct dvb_frontend *fe,
 			Standard = HF_DVBC_7MHZ;
 		else
 			Standard = HF_DVBC_8MHZ;
+		break;
 	default:
 		return -EINVAL;
 	}