[media] cxd2820r: fix gpio null pointer dereference

Setting GPIOs during probe causes null pointer deference when
GPIOLIB was not selected by Kconfig. Initialize driver private
field before calling set gpios.

It is regressing bug since 4.9.

Fixes: 07fdf7d9 ("[media] cxd2820r: add I2C driver bindings")
Reported-by: NChris Rankin <rankincj@gmail.com>
Tested-by: NChris Rankin <rankincj@gmail.com>
Tested-by: NHåkan Lennestål <hakan.lennestal@gmail.com>
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/cxd2820r_core.c

@@ -615,6 +615,7 @@ static int cxd2820r_probe(struct i2c_client *client,
 	}
 
 	priv->client[0] = client;
+	priv->fe.demodulator_priv = priv;
 	priv->i2c = client->adapter;
 	priv->ts_mode = pdata->ts_mode;
 	priv->ts_clk_inv = pdata->ts_clk_inv;
@@ -697,7 +698,6 @@ static int cxd2820r_probe(struct i2c_client *client,
 	memcpy(&priv->fe.ops, &cxd2820r_ops, sizeof(priv->fe.ops));
 	if (!pdata->attach_in_use)
 		priv->fe.ops.release = NULL;
-	priv->fe.demodulator_priv = priv;
 	i2c_set_clientdata(client, priv);
 
 	/* Setup callbacks */