Cleanup _OSC evaluation code.  Some whitespace changes and a few other
minor cleanups.
Reviewed-by: NAndrew Patterson <andrew.patterson@hp.com>
Tested-by: NAndrew Patterson <andrew.patterson@hp.com>
Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: NTaku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>