This patch changes the result code returned by the UHCI driver for a
certain class of errors.  Under a number of circumstances a USB device is
obliged to send a response packet within a fairly short turn-around time,
typically 1 - 10 microseconds depending on the bus speed.  Failure to do
so is a protocol error and should be reported as such, not as a timeout,
which is really a higher-level concept.  I believe the EHCI driver already
does this.

I trust nobody will object to the update this patch adds to
Documentation/usb/error-codes.txt, making this more explicit.

In a vaguely related change, the patch corrects the terminology in a few
comments.  The parts of a control transfer are called "stages", not
"phases".