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Fix avr_write_byte() #485

Job	Run time
linux-x86_64	1m 25s
macos-x86_64	53s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 18s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 28s
macos-x86_64_autotools	56s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 30s
mingw (mingw64, x86_64)	3m 34s
linux-x86_64-autotools	1m 30s
mingw (ucrt64, ucrt-x86_64)	3m 37s
mingw (clang64, clang-x86_64)	2m 58s
msvc (x86, Win32)	1m 48s
msvc (x64, x64)	1m 41s
	22m 38s

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