[media] qt1010: do not change frequency during init

Changing cached frequency during init is something no-no.
Make it behave a little bit better. After that device could
survive from suspend/resume when streaming is ongoing.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/tuners/qt1010.c

@@ -395,7 +395,8 @@ static int qt1010_init(struct dvb_frontend *fe)
 		if ((err = qt1010_init_meas2(priv, i, &tmpval)))
 			return err;
 
-	c->frequency = 545000000; /* Sigmatek DVB-110 545000000 */
+	if (!c->frequency)
+		c->frequency = 545000000; /* Sigmatek DVB-110 545000000 */
 				      /* MSI Megasky 580 GL861 533000000 */
 	return qt1010_set_params(fe);
 }