Staging: comedi: fix EXPORT SYMBOL coding style issue in ni_labpc.c

This is a patch to the ni_labpc.c file that fixes up, EXPORT SYMBOL(foo)
should immediately follow its function/variable warnings, found by the
checkpatch.pl tool

Signed-off-by: Maurice Dawson <mauricedawson2699@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>