staging: comedi: addi_eeprom: fix remaining checkpatch.pl issues

Fix the following checkpatch.pl issues:

ERROR: code indent should use tabs where possible
WARNING: please, no spaces at the start of a line
WARNING: line over 80 characters

This file is now checkpatch.pl clean.

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>