gpio: Remove unused local OF node pointers

After the commit 448cf90513d9 ("gpio: Get rid of duplicate of_node
assignment in the drivers") the OF node local pointers become unused.
Remove them for good and make compiler happy about.

Fixes: 448cf90513d9 ("gpio: Get rid of duplicate of_node assignment in the drivers")
Reported-by: Stephen Rothwell <[e-mail]>
Signed-off-by: Andy Shevchenko <[e-mail]>
[Bart: removed unrelated change in gpio-brcmstb]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-gw-pld.c

···
 			const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
-	struct device_node *np = dev->of_node;
 	struct gw_pld *gw;
 	int ret;
 

drivers/gpio/gpio-mt7621.c

···
 }
 
 static int
-mediatek_gpio_bank_probe(struct device *dev,
-			 struct device_node *node, int bank)
+mediatek_gpio_bank_probe(struct device *dev, int bank)
 {
 	struct mtk *mtk = dev_get_drvdata(dev);
 	struct mtk_gc *rg;
···
 	platform_set_drvdata(pdev, mtk);
 
 	for (i = 0; i < MTK_BANK_CNT; i++) {
-		ret = mediatek_gpio_bank_probe(dev, np, i);
+		ret = mediatek_gpio_bank_probe(dev, i);
 		if (ret)
 			return ret;
 	}

drivers/gpio/gpio-rda.c

···
 
 static int rda_gpio_probe(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
 	struct device *dev = &pdev->dev;
 	struct gpio_irq_chip *girq;
 	struct rda_gpio *rda_gpio;