Bug#984340: solarpowerlog: ftbfs with GCC-11

[Tobias Frost]

Source: solarpowerlog
Followup-For: Bug #984340
Control: tags -1 pending

Fixed with 
https://github.com/coldtobi/solarpowerlog/commit/241b20fad63a4d1be27fd0ea11bfb3cd14a25004.

Will upload once bullseye is out of the door.

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tobi