[nagios-plugins] check_snmp: small improvement (#1173)

Just turning attached patch of github issue #1029 into a push request
You can merge this Pull Request by running:

  git pull https://github.com/waja/nagios-plugins github1029

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

  https://github.com/nagios-plugins/nagios-plugins/pull/1173

-- Commit Summary --

  * check_snmp: small improvement

-- File Changes --

    M plugins/check_snmp.c (4)

-- Patch Links --

https://github.com/nagios-plugins/nagios-plugins/pull/1173.patch
https://github.com/nagios-plugins/nagios-plugins/pull/1173.diff

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