Fix ups nut PHP 8 issue

[murrant]

https://community.librenms.org/t/sensors-initialisation-fails-with-php-8-1/19697

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[librenms-bot]

This pull request has been mentioned on LibreNMS Community. There might be relevant details there:

https://community.librenms.org/t/sensors-initialisation-fails-with-php-8-1/19697/2

[librenms-bot]

This pull request has been mentioned on LibreNMS Community. There might be relevant details there:

https://community.librenms.org/t/error-discovering-sensors-module/19699/3