Fix additional warnings #881

Job	Run time
build (macos-latest, esp8266, gcc)	30m 10s
build (ubuntu-latest, esp8266, gcc)	17m 22s
build (macos-latest, host, gcc)	18m 45s
build (macos-latest, rp2040, gcc)	13m 8s
build (ubuntu-latest, host, clang, Host)	23m 49s
build (ubuntu-latest, host, gcc)	21m 57s
build (ubuntu-latest, host, gcc64, Host)	20m 12s
build (ubuntu-latest, rp2040, gcc)	18m 0s
build (windows-latest, esp8266, gcc)	9m 28s
build (windows-latest, host, gcc)	28m 4s
build (windows-latest, rp2040, gcc)	8m 11s
	3h 29m 6s

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