Only set the status of a completed xfer just before giving it back to the stack.  This will allow stricter checks when aborting transfers.
Only set the status of a completed xfer just before giving it back to
the stack.  This will allow stricter checks when aborting transfers.

While here update a comment about short transfer and multi-TRB TD since
bulk transfers can also use a chain now.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars