Don't require 'dahdi_hardware -v' to show the driver for a USB device.
Only works when the usbfs is not used (when /proc/bus/usb is not mounted).
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
git-svn-id: http://svn.astersk.org/svn/dahdi/tools/trunk@9699 17933a7a-c749-41c5-a318-cba88f637d49