pinctrl: iproc-gpio: Silence probe deferral messages

We can have gpiochip_add_data() return -EPROBE_DEFER which will make us
produce the "unable to add GPIO chip" message which is confusing. Use
dev_err_probe() to silence probe deferral messages.

Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Link: https://lore.kernel.org/r/20230808180733.2081353-2-florian.fainelli@broadcom.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: ffainelli

drivers/pinctrl/bcm/pinctrl-iproc-gpio.c

@@ -891,10 +891,8 @@ static int iproc_gpio_probe(struct platform_device *pdev)
 	}
 
 	ret = gpiochip_add_data(gc, chip);
-	if (ret < 0) {
-		dev_err(dev, "unable to add GPIO chip\n");
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "unable to add GPIO chip\n");
 
 	if (!no_pinconf) {
 		ret = iproc_gpio_register_pinconf(chip);