[PATCH] USB Storage: sddr09 cleanups

This is the second of three patches to prepare the sddr09 subdriver for
conversion to the Sim-SCSI framework.  This patch (as595) updates the
code to use standard error values for return codes instead of our
special-purpose USB_STOR_TRANSPORT_... codes.  The reverse update is
then needed in the transport routine, but with the Sim-SCSI framework
that routine will go away.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Andries Brouwer <Andries.Brouwer@cwi.nl>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>