staging: comedi: ni_tio: tidy up some function declarations

Fix the whitespace in some of the function declarations to avoid
the ugly line breaks and fix a couple checkpatch.pl issues:

WARNING: line over 80 characters
WARNING: Unnecessary space before function pointer arguments

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