Merge from NetBSD:

usb.c:	revision 1.39

	revision 1.39
	date: 2000/02/22 11:30:56;  author: augustss;  lines: +7 -1
	Prepare a little for having USB interrupt processing done
	outside the hard interrupt level (in a thread or a softintr).
	No real soft processing done yet.

sys/dev/usb/usb.c

@@ -679,6 +679,12 @@ usbd_add_event(int type, usbd_device_handle dev)
 	splx(s);
 }
 
+void
+usb_schedsoftintr(struct usbd_bus *bus)
+{
+       bus->methods->soft_intr(bus);
+}
+
 #if defined(__NetBSD__) || defined(__OpenBSD__)
 int
 usb_activate(device_ptr_t self, enum devact act)