Staging: comedi: me_daq: fix checkpatch.pl issues

This fixes a number of checkpatch.pl issues in the me_daq
driver.

Cc: Michael Hillmann <hillmann@syscongroup.de>
Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>