V4L/DVB (4284): Cx24123: fix set_voltage function according to the specs

The set_voltage function in cx24123.c was corrected to match how it is
described in the CX24123 specs, producing the correct behaviour for cards
that require it.
Acked-by: Andrew de Quincey <adq_dvb@lidskialf.net>

Signed-off-by: Saqeb Akhter <johoja@gmail.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/cx24123.c

@@ -670,10 +670,10 @@ static int cx24123_set_voltage(struct dvb_frontend* fe, fe_sec_voltage_t voltage
 	switch (voltage) {
 	case SEC_VOLTAGE_13:
 		dprintk("%s: setting voltage 13V\n", __FUNCTION__);
-		return cx24123_writereg(state, 0x29, val | 0x80);
+		return cx24123_writereg(state, 0x29, val & 0x7f);
 	case SEC_VOLTAGE_18:
 		dprintk("%s: setting voltage 18V\n", __FUNCTION__);
-		return cx24123_writereg(state, 0x29, val & 0x7f);
+		return cx24123_writereg(state, 0x29, val | 0x80);
 	default:
 		return -EINVAL;
 	};