[media] rtl820t: Add a debug msg when PLL gets locked

	[ 2255.342797] r820t 3-001a: generic_set_freq: PLL locked on frequency 725476191 Hz, gain=45
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Antti Palosaari <crope@iki.fi>

drivers/media/tuners/r820t.c

@@ -1215,6 +1215,12 @@ static int generic_set_freq(struct dvb_frontend *fe,
 		goto err;
 
 	rc = r820t_sysfreq_sel(priv, freq, type, std, delsys);
+	if (rc < 0)
+		goto err;
+
+	tuner_dbg("%s: PLL locked on frequency %d Hz, gain=%d\n",
+		  __func__, freq, r820t_read_gain(priv));
+
 err:
 
 	if (rc < 0)