[nagios-plugins] check_ifstatus: perfdata bug (#1169)

Just turning attached patch of github issue #721 into a push request
You can merge this Pull Request by running:

  git pull https://github.com/waja/nagios-plugins github721

Or you can view, comment on it, or merge it online at:

  https://github.com/nagios-plugins/nagios-plugins/pull/1169

-- Commit Summary --

  * check_ifstatus: perfdata bug

-- File Changes --

    M THANKS.in (1)
    M plugins-scripts/check_ifstatus.pl (2)

-- Patch Links --

https://github.com/nagios-plugins/nagios-plugins/pull/1169.patch
https://github.com/nagios-plugins/nagios-plugins/pull/1169.diff

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