-current panics when usb device is detached

[M. Warner Losh]

In message: <4404AAF1.6090009 at savvis.net>
            Maksim Yevmenkin <maksim.yevmenkin at savvis.net> writes:
: is usb in -current broken? my laptop panics when i detach usb device.

I'll take a look into this, since I think I may have broken this...

Warner