It turns out that the Konica-Minolta DiMAGE A2 camera, in addition to all
its other problems, returns a 0-length reply to the GetMaxLUN request.
With this patch (accept a null reply as meaning a single LUN) it is
somewhat useable.

It's amazing to me that vendors have this much trouble counting to 1....
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>