[media] media: stv0367: fix frontend modulation initialization with FE_CAB_MOD_QAM256

It was using the wrong constant for QAM256 on get_frontend.
Signed-off-by: Maks Naumov <maksqwe1@ukr.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/stv0367.c

@@ -3163,7 +3163,7 @@ static int stv0367cab_get_frontend(struct dvb_frontend *fe)
 	case FE_CAB_MOD_QAM128:
 		p->modulation = QAM_128;
 		break;
-	case QAM_256:
+	case FE_CAB_MOD_QAM256:
 		p->modulation = QAM_256;
 		break;
 	default: