Fixed the sign compare causing build failure #36

Job	Run time
windows-2019 VS2019	44m 25s
macos-12 appleclang13/C++17 py3.10 MacOS-12	18m 29s
windows-2022 VS2022	1h 7m 7s
Ubuntu latest releases gcc12 C++17 avx2 exr3.2 ocio2.3	15m 14s
macos-13 appleclang14/C++17 py3.11 MacOS-13	21m 39s
VFX2021 gcc9/C++17 py3.7 exr3.1 ocio2.0	13m 59s
Ubuntu bleeding edge gcc13 C++20 py3.10 OCIO/libtiff/exr-master avx2	18m 4s
macos-14 appleclang15/C++20 py3.11 MacOS-14-ARM	9m 38s
VFX2021 clang10/C++14 avx2 exr3.1 ocio2.0	13m 7s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	13m 52s
VFX2022 gcc9/C++17 py39 exr3.1 ocio2.1	11m 6s
Ubuntu debug gcc9/C++17, sse4.2, exr3.1	14m 4s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	11m 3s
Ubuntu static libs gcc9 C++17 exr2.4	6m 15s
Ubuntu clang-format	2m 28s
VFX2022 icc/C++17 py3.9 exr3.1 ocio2.1 qt5.15	16m 5s
VFX2022 icx/C++17 py3.9 exr3.1 ocio2.1 qt5.15	14m 31s
VFX2022 sanitizers	33m 1s
VFX2023 gcc11/C++17 py3.10 exr3.1 ocio2.2	11m 37s
VFX2024 gcc11/C++17 py3.11 exr3.2 ocio2.3	7m 23s
VFX2021 oldest/hobbled gcc9.3/C++17 py3.7 exr-3.1 no-sse no-ocio	13m 29s
VFX2023 abi check	11m 42s
	6h 28m 18s

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