gpio: max730x: use devres to shrink and simplify code

Use managed variants of gpiochip_add_data() and mutex_init() to drop a
label and lose a couple LOC.

Reviewed-by: Linus Walleij <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-max730x.c

···
 
 	pdata = dev_get_platdata(dev);
 
-	mutex_init(&ts->lock);
+	ret = devm_mutex_init(ts->dev, &ts->lock);
+	if (ret)
+		return ret;
+
 	dev_set_drvdata(dev, ts);
 
 	/* Power up the chip and disable IRQ output */
···
 			int offset = (i - 1) * 4 + j;
 			ret = max7301_direction_input(&ts->chip, offset);
 			if (ret)
-				goto exit_destroy;
+				return ret;
 		}
 	}
 
-	ret = gpiochip_add_data(&ts->chip, ts);
-	if (!ret)
-		return ret;
-
-exit_destroy:
-	mutex_destroy(&ts->lock);
-	return ret;
+	return devm_gpiochip_add_data(ts->dev, &ts->chip, ts);
 }
 EXPORT_SYMBOL_GPL(__max730x_probe);
 
···
 
 	/* Power down the chip and disable IRQ output */
 	ts->write(dev, 0x04, 0x00);
-	gpiochip_remove(&ts->chip);
-	mutex_destroy(&ts->lock);
 }
 EXPORT_SYMBOL_GPL(__max730x_remove);