gpio: max732x: Remove duplicate NULL check

Since i2c_unregister_device() became NULL-aware we may remove duplicate
NULL check.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-max732x.c

@@ -709,8 +709,7 @@ static int max732x_probe(struct i2c_client *client,
 	return 0;
 
 out_failed:
-	if (chip->client_dummy)
-		i2c_unregister_device(chip->client_dummy);
+	i2c_unregister_device(chip->client_dummy);
 	return ret;
 }
 
@@ -734,8 +733,7 @@ static int max732x_remove(struct i2c_client *client)
 	gpiochip_remove(&chip->gpio_chip);
 
 	/* unregister any dummy i2c_client */
-	if (chip->client_dummy)
-		i2c_unregister_device(chip->client_dummy);
+	i2c_unregister_device(chip->client_dummy);
 
 	return 0;
 }