speedtch testatm.c,1.4,1.5

[Duncan Sands]

> BTW do we really need to manually release interfaces we've claimed?
> Won't they get disconnect()-ed by the usb core?

Yes, because there's also "logical disconnect", in which just one
interface can get disconnected (you can play with this easily
enough using usbfs; maybe you can also do it by writing to a sysfs
file but I don't remember).  In order to keep things simple I would
like to unbind from all interfaces.

Ciao,

D.