This is a slightly cleaned up version of that earlier patch:

- Makes both copies of the clear_halt() logic know that
   usb_pipein() returns boolean (zero/not) not integer (0/1).
   This resolves a problem folk have had with usb-storage.
   (I looked at kernel uses of usb_pipein and it really was
   only the clear_halt logic that cares.)

- Removes some code from the "standard" version; no point
   in Linux expecting devices to do something neither Microsoft
   nor Apple will test for.