This includes some small updates to "usbtest", mostly
from Martin Diehl.  Please merge.



usbtest updates, supporting new firmware

    - Support the new usbtest_fw-20040305 EZ-USB firmware,
      which renumerates and handles full speed ISO transfers.
      (From Martin Diehl.)

    - Minor cleanups:  use dev_dbg(), let some slightly-off
      devices work in the control queueing test.

    - Be pickier about unlink tests:  insist that async
      and sync unlinks give the appropriate fault code.