V4L/DVB (7070): Fix some tuning problems

The attached patch solves all my vdr tuning problems on a dib7000p
nova-t stick as far as I could check within the last weekend.

It disables streaming while tuning, like that the number of faulty TS
packets is reduced.

Signed-off-by: Soeren Moch <Soeren.Moch@stud.uni-hannover.de>
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/dvb/frontends/dib3000mc.c b/drivers/media/dvb/frontends/dib3000mc.c
index 3667f8e..fa85160 100644
--- a/drivers/media/dvb/frontends/dib3000mc.c
+++ b/drivers/media/dvb/frontends/dib3000mc.c
@@ -684,6 +684,9 @@
 				struct dvb_frontend_parameters *fep)
 {
 	struct dib3000mc_state *state = fe->demodulator_priv;
+    int ret;
+
+	dib3000mc_set_output_mode(state, OUTMODE_HIGH_Z);
 
 	state->current_bandwidth = fep->u.ofdm.bandwidth;
 	dib3000mc_set_bandwidth(state, BANDWIDTH_TO_KHZ(fep->u.ofdm.bandwidth));
@@ -715,10 +718,11 @@
 		dib3000mc_get_frontend(fe, fep);
 	}
 
+    ret = dib3000mc_tune(fe, fep);
+
 	/* make this a config parameter */
 	dib3000mc_set_output_mode(state, OUTMODE_MPEG2_FIFO);
-
-	return dib3000mc_tune(fe, fep);
+    return ret;
 }
 
 static int dib3000mc_read_status(struct dvb_frontend *fe, fe_status_t *stat)