Staging: comedi: Coding style cleanups in adv_pci_dio.c

This patch fixes up many coding style issues in adv_pci_dio.c found by
checkpatch.pl
Signed-off-by: NMark Rankilor <reodge@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>