mfd: tc6393xb: Make disable callback return void

All implementations return 0, so simplify accordingly.

This is a preparation for making platform remove callbacks return void.

Signed-off-by: Uwe Kleine-König <[e-mail]>
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/mach-pxa/eseries.c

···
 	return 0;
 }
 
-int eseries_tmio_disable(struct platform_device *dev)
+void eseries_tmio_disable(struct platform_device *dev)
 {
 	gpio_set_value(GPIO_ESERIES_TMIO_SUSPEND, 0);
 	gpio_set_value(GPIO_ESERIES_TMIO_PCLR, 0);
-	return 0;
 }
 
 int eseries_tmio_suspend(struct platform_device *dev)

arch/arm/mach-pxa/tosa.c

···
 	return rc;
 }
 
-static int tosa_tc6393xb_disable(struct platform_device *dev)
+static void tosa_tc6393xb_disable(struct platform_device *dev)
 {
 	gpio_free(TOSA_GPIO_TC6393XB_L3V_ON);
 	gpio_free(TOSA_GPIO_TC6393XB_SUSPEND);
 	gpio_free(TOSA_GPIO_TC6393XB_REST_IN);
-
-	return 0;
 }
 
 static int tosa_tc6393xb_resume(struct platform_device *dev)

drivers/mfd/tc6393xb.c

···
 {
 	struct tc6393xb_platform_data *tcpd = dev_get_platdata(&dev->dev);
 	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
-	int ret;
 
 	mfd_remove_devices(&dev->dev);
 
 	tc6393xb_detach_irq(dev);
 
-	ret = tcpd->disable(dev);
+	tcpd->disable(dev);
 	clk_disable_unprepare(tc6393xb->clk);
 	iounmap(tc6393xb->scr);
 	release_resource(&tc6393xb->rscr);
 	clk_put(tc6393xb->clk);
 	kfree(tc6393xb);
 
-	return ret;
+	return 0;
 }
 
 #ifdef CONFIG_PM

include/linux/mfd/tc6393xb.h

···
 	u16	scr_gper;	/* GP Enable */
 
 	int	(*enable)(struct platform_device *dev);
-	int	(*disable)(struct platform_device *dev);
+	void	(*disable)(struct platform_device *dev);
 	int	(*suspend)(struct platform_device *dev);
 	int	(*resume)(struct platform_device *dev);