Fix ISDN return types.

diff -urpN --exclude-from=/home/davej/.exclude bk-linus/drivers/isdn/i4l/isdn_net_lib.c linux-2.5/drivers/isdn/i4l/isdn_net_lib.c
@@ -1777,6 +1776,7 @@ bhup(struct fsm_inst *fi, int pr, void *
 
 	printk(KERN_INFO "%s: disconnected\n", idev->name);
 	fsm_change_state(fi, ST_WAIT_DHUP);
+	return 0;
 }
 
 static int

@@ -1898,7 +1898,7 @@ isdn_net_event_callback(struct isdn_slot
 static int
 isdn_net_handle_event(isdn_net_dev *idev, int pr, void *arg)
 {
-	fsm_event(&idev->fi, pr, arg);
+	return fsm_event(&idev->fi, pr, arg);
 }
 
 static int