Clamp NaN to white when converting to integer #1710

Job	Run time
test_avif_decoding	1m 19s
test_features	52s
test_features (default)	1m 50s
Fuzz targets (afl)	2m 46s
Fuzz targets (cargo-fuzz)	47s
test_features (rayon)	39s
build_benchmarks	44s
test_features (avif)	55s
test_features (bmp)	36s
cargo-deny	16s
test_features (dds)	34s
cargo-semver-checks	28s
public_private_dependencies	25s
test_features (exr)	40s
test_features (ff)	31s
test_features (gif)	34s
rustfmt	4s
test_features (hdr)	28s
test_toolchains (1.70.0)	28s
test_features (ico)	42s
test_other_archs (powerpc-unknown-linux-gnu)	2m 37s
test_toolchains (nightly)	1m 5s
test_features (jpeg)	32s
test_other_archs (i686-unknown-linux-gnu)	1m 55s
test_toolchains (beta)	1m 44s
test_features (png)	41s
test_features (pnm)	51s
clippy	2m 5s
test_features (qoi)	27s
test_features (tga)	25s
test_features (tiff)	33s
test_features (webp)	30s
	29m 3s

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