Fix additional warnings #880

Job	Run time
build (macos-latest, esp8266, gcc)	32m 18s
build (macos-latest, host, gcc)	18m 47s
build (ubuntu-latest, esp8266, gcc)	18m 7s
build (macos-latest, rp2040, gcc)	18m 9s
build (ubuntu-latest, host, clang, Host)	24m 8s
build (ubuntu-latest, host, gcc)	21m 20s
build (ubuntu-latest, host, gcc64, Host)	20m 35s
build (ubuntu-latest, rp2040, gcc)	18m 31s
build (windows-latest, esp8266, gcc)	9m 1s
build (windows-latest, host, gcc)	28m 1s
build (windows-latest, rp2040, gcc)	7m 49s
	3h 36m 46s

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