staging: comedi: usbduxfast: remove 'owner' from usb_driver

The struct usb_driver does not have an 'owner' field. Remove the
code in this driver that initializes it.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>