bluetooth: Make hci_sock_cleanup() return void

hci_sock_cleanup() always returns 0 and its return value isn't used
anywhere in the code.

Compile-tested with 'make allyesconfig && make net/bluetooth/bluetooth.ko'

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/bluetooth.h

@@ -170,7 +170,7 @@ static inline int skb_frags_no(struct sk_buff *skb)
 int bt_err(__u16 code);
 
 extern int hci_sock_init(void);
-extern int hci_sock_cleanup(void);
+extern void hci_sock_cleanup(void);
 
 extern int bt_sysfs_init(void);
 extern void bt_sysfs_cleanup(void);

net/bluetooth/hci_sock.c

@@ -734,14 +734,12 @@ int __init hci_sock_init(void)
 	return err;
 }
 
-int __exit hci_sock_cleanup(void)
+void __exit hci_sock_cleanup(void)
 {
 	if (bt_sock_unregister(BTPROTO_HCI) < 0)
 		BT_ERR("HCI socket unregistration failed");
 
 	hci_unregister_notifier(&hci_sock_nblock);
 
 	proto_unregister(&hci_sk_proto);
-
-	return 0;
 }