iiod: Add default env var to service file

analogdevicesinc / libiio

A cross platform library for interfacing with local and remote Linux IIO devices

http://analogdevicesinc.github.io/libiio/

GNU Lesser General Public License v2.1

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Closed dennis-ju closed 4 months ago

dennis-ju commented 4 months ago

Systemd now gives a warning when IIOD_EXTRA_OPTS is unset.

This change sets it to an empty string by default while still allowing it be overridden by /etc/default/iiod.

Fixes #1142.