[media] dvb_frontend: merge duplicate dvb_tuner_ops.release implementations

Most release callback functions are identical: free the "tuner_priv"
and clear it.  Let's eliminate some bloat by providing this simple
implementation in the dvb_frontend library.

Signed-off-by: Max Kellermann <max.kellermann@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/dvb-pll.c

@@ -606,13 +606,6 @@ static int dvb_pll_configure(struct dvb_frontend *fe, u8 *buf,
 	return (div * desc->entries[i].stepsize) - desc->iffreq;
 }
 
-static int dvb_pll_release(struct dvb_frontend *fe)
-{
-	kfree(fe->tuner_priv);
-	fe->tuner_priv = NULL;
-	return 0;
-}
-
 static int dvb_pll_sleep(struct dvb_frontend *fe)
 {
 	struct dvb_pll_priv *priv = fe->tuner_priv;
@@ -745,7 +738,7 @@ static int dvb_pll_init(struct dvb_frontend *fe)
 }
 
 static const struct dvb_tuner_ops dvb_pll_tuner_ops = {
-	.release = dvb_pll_release,
+	.release = dvb_tuner_simple_release,
 	.sleep = dvb_pll_sleep,
 	.init = dvb_pll_init,
 	.set_params = dvb_pll_set_params,