Fix iCCP chunk encoding #645

Job	Run time
powerpc_cross	7s
feature_check (ubuntu-latest)	1m 0s
build (1.57.0, ubuntu-latest)	1m 0s
rustfmt	8s
feature_check (macos-latest)	31s
build (1.57.0, windows-latest)	1m 24s
feature_check (unstable, ubuntu-latest)	58s
test_all (ubuntu-latest)	2m 59s
build (1.57.0, macos-latest)	1m 0s
feature_check (unstable, macos-latest)	31s
build (stable, ubuntu-latest)	7s
test_all (macos-latest)	2m 24s
feature_check (benchmarks, ubuntu-latest)	1m 1s
build (stable, windows-latest)	1m 7s
feature_check (benchmarks, macos-latest)	31s
build (stable, macos-latest)	11s
build (beta, ubuntu-latest)	16s
build (beta, windows-latest)	42s
build (beta, macos-latest)	15s
build (nightly, ubuntu-latest)	15s
build (nightly, windows-latest)	42s
build (nightly, macos-latest)	16s
	17m 25s

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