[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/tuners/tea5761.c

@@ -284,14 +284,6 @@ int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
 	return 0;
 }
 
-static int tea5761_release(struct dvb_frontend *fe)
-{
-	kfree(fe->tuner_priv);
-	fe->tuner_priv = NULL;
-
-	return 0;
-}
-
 static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	struct tea5761_priv *priv = fe->tuner_priv;
@@ -305,7 +297,7 @@ static const struct dvb_tuner_ops tea5761_tuner_ops = {
 	},
 	.set_analog_params = set_radio_freq,
 	.sleep		   = set_radio_sleep,
-	.release           = tea5761_release,
+	.release           = dvb_tuner_simple_release,
 	.get_frequency     = tea5761_get_frequency,
 	.get_status        = tea5761_get_status,
 	.get_rf_strength   = tea5761_get_rf_strength,