Bug#534413: hw-detect: should not rely on testing for /proc/bus/usb

[Frans Pop <elendil@planet.nl>]

tag 534413 pending
thanks

On Wednesday 24 June 2009, Frans Pop wrote:
> In hw-detect.sh there are two locations where the script checks if
> /sys/bus/usb exists, but usbfs will no longer be available in kernel
> 2.6.31, so another method will need to be found.

Actually, we use /proc/bus/usb in one location and /sys/bus/usb in another, 
so just use the latter for both.