powerpc/83xx/mpc8349emitx: Make mcu_gpiochip_remove() return void

Up to now mcu_gpiochip_remove() returns zero unconditionally. Make it
return void instead which makes it easier to see in the callers that
there is no error to handle.

Also the return value of i2c remove callbacks is ignored anyway.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211021105657.72572-1-u.kleine-koenig@pengutronix.de

arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c

@@ -135,11 +135,10 @@ static int mcu_gpiochip_add(struct mcu *mcu)
 	return gpiochip_add_data(gc, mcu);
 }
 
-static int mcu_gpiochip_remove(struct mcu *mcu)
+static void mcu_gpiochip_remove(struct mcu *mcu)
 {
 	kfree(mcu->gc.label);
 	gpiochip_remove(&mcu->gc);
-	return 0;
 }
 
 static int mcu_probe(struct i2c_client *client)
@@ -198,9 +197,7 @@ static int mcu_remove(struct i2c_client *client)
 		glob_mcu = NULL;
 	}
 
-	ret = mcu_gpiochip_remove(mcu);
-	if (ret)
-		return ret;
+	mcu_gpiochip_remove(mcu);
 	kfree(mcu);
 	return 0;
 }