nubus: Make struct nubus_driver::remove return void

The nubus core ignores the return value of the remove callback (in
nubus_device_remove()) and all implementers return 0 anyway.

So make it impossible for future drivers to return an unused error code
by changing the remove prototype to return void.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Finn Thain <fthain@linux-m68k.org>
Link: https://lore.kernel.org/r/20210727080840.3550927-3-u.kleine-koenig@pengutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/8390/mac8390.c

@@ -428,13 +428,12 @@ static int mac8390_device_probe(struct nubus_board *board)
 	return err;
 }
 
-static int mac8390_device_remove(struct nubus_board *board)
+static void mac8390_device_remove(struct nubus_board *board)
 {
 	struct net_device *dev = nubus_get_drvdata(board);
 
 	unregister_netdev(dev);
 	free_netdev(dev);
-	return 0;
 }
 
 static struct nubus_driver mac8390_driver = {

drivers/net/ethernet/natsemi/macsonic.c

@@ -603,7 +603,7 @@ static int mac_sonic_nubus_probe(struct nubus_board *board)
 	return err;
 }
 
-static int mac_sonic_nubus_remove(struct nubus_board *board)
+static void mac_sonic_nubus_remove(struct nubus_board *board)
 {
 	struct net_device *ndev = nubus_get_drvdata(board);
 	struct sonic_local *lp = netdev_priv(ndev);
@@ -613,8 +613,6 @@ static int mac_sonic_nubus_remove(struct nubus_board *board)
 			  SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
 			  lp->descriptors, lp->descriptors_laddr);
 	free_netdev(ndev);
-
-	return 0;
 }
 
 static struct nubus_driver mac_sonic_nubus_driver = {

include/linux/nubus.h

@@ -86,7 +86,7 @@ extern struct list_head nubus_func_rsrcs;
 struct nubus_driver {
 	struct device_driver driver;
 	int (*probe)(struct nubus_board *board);
-	int (*remove)(struct nubus_board *board);
+	void (*remove)(struct nubus_board *board);
 };
 
 extern struct bus_type nubus_bus_type;