ural driver stalls under FreeBSD7.1

[Nathan Butcher]

I have a Buffalo WLI-U2-KG54-AI wireless USB adaptor.
It has been malfunctioning for quite a while under FreeBSD7.0 and 7.1

Typically, It works for a while until eventually it stalls data
transfers completely. It always seems to do this after an unspecified
amount of time.

I know the hardware isn't at fault because the device works fine under
Linux.