mfd: twl4030: Make twl4030_exit_irq() return void

If twl4030_exit_irq() returns an error, the effect is that the caller
(twl_remove()) forwards the error to the i2c core without unregistering
its dummy slave devices. This only makes the i2c core emit another
error message and then it still removes the device.

In this situation it doesn't make sense to abort the remove cleanup and not
unregister the slave devices. So do that. Then return value is actually
unused and twl4030_exit_irq() can better be changed to return no value at
all.

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

drivers/mfd/twl-core.c

···
 static int twl_remove(struct i2c_client *client)
 {
 	unsigned i, num_slaves;
-	int status = 0;
 
 	if (twl_class_is_4030())
-		status = twl4030_exit_irq();
+		twl4030_exit_irq();
 	else
 		twl6030_exit_irq();
-
-	if (status < 0)
-		return status;
 
 	num_slaves = twl_get_num_slaves();
 	for (i = 0; i < num_slaves; i++) {

drivers/mfd/twl-core.h

···
 extern int twl6030_init_irq(struct device *dev, int irq_num);
 extern void twl6030_exit_irq(void);
 extern int twl4030_init_irq(struct device *dev, int irq_num);
-extern int twl4030_exit_irq(void);
+extern void twl4030_exit_irq(void);
 extern int twl4030_init_chip_irq(const char *chip);
 
 #endif /*  __TWL_CORE_H__ */

drivers/mfd/twl4030-irq.c

···
 	return status;
 }
 
-int twl4030_exit_irq(void)
+void twl4030_exit_irq(void)
 {
 	/* FIXME undo twl_init_irq() */
-	if (twl4030_irq_base) {
+	if (twl4030_irq_base)
 		pr_err("twl4030: can't yet clean up IRQs?\n");
-		return -ENOSYS;
-	}
-	return 0;
 }
 
 int twl4030_init_chip_irq(const char *chip)