mux: gpio: Simplify code by using dev_err_probe()

Use already prepared dev_err_probe() introduced by the commit
a787e540 ("driver core: add device probe log helper").
It simplifies EPROBE_DEFER handling.
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210330193325.68362-3-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mux/gpio.c

@@ -66,12 +66,9 @@ static int mux_gpio_probe(struct platform_device *pdev)
 	mux_chip->ops = &mux_gpio_ops;
 
 	mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);
-	if (IS_ERR(mux_gpio->gpios)) {
-		ret = PTR_ERR(mux_gpio->gpios);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "failed to get gpios\n");
-		return ret;
-	}
+	if (IS_ERR(mux_gpio->gpios))
+		return dev_err_probe(dev, PTR_ERR(mux_gpio->gpios),
+				     "failed to get gpios\n");
 	WARN_ON(pins != mux_gpio->gpios->ndescs);
 	mux_chip->mux->states = BIT(pins);