staging: comedi: dt9812: usb_bulk_msg() timeout is in milliseconds

The timeout values passed to usb_bulk_msg() should be in milliseconds
not jiffies.

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>