munin smart plugin smartctl exit status 64

Problem is that (according to the man page) smartctl sets bit no 6 if there was an error in the past, so now while everything is alright, the exit code is numeric 64.

http://serverfault.com/questions/461456/munins-smart-plugin-keeps-reporting-an-error-in-the-past-because-of-the-exit-co

https://github.com/munin-monitoring/munin/pull/247

https://github.com/munin-monitoring/munin/blob/devel/plugins/node.d/smart_

最新版は以下の設定で、過去のエラーは無視

[smart_sda]
env.ignoreexit 64