Clamp NaN to white when converting to integer #1713

Job	Run time
build_benchmarks	48s
cargo-deny	18s
Fuzz targets (cargo-fuzz)	51s
Fuzz targets (afl)	2m 27s
cargo-semver-checks	36s
clippy	1m 59s
public_private_dependencies	27s
rustfmt	10s
test_avif_decoding	1m 18s
test_features	25s
test_other_archs (powerpc-unknown-linux-gnu)	2m 52s
test_features (default)	1m 50s
test_toolchains (1.70.0)	27s
test_other_archs (i686-unknown-linux-gnu)	2m 5s
test_toolchains (nightly)	1m 47s
test_features (rayon)	30s
test_toolchains (beta)	1m 58s
test_features (avif)	56s
test_features (bmp)	37s
test_features (dds)	30s
test_features (exr)	59s
test_features (ff)	26s
test_features (gif)	33s
test_features (hdr)	31s
test_features (ico)	53s
test_features (jpeg)	35s
test_features (png)	31s
test_features (pnm)	33s
test_features (qoi)	26s
test_features (tga)	31s
test_features (tiff)	37s
test_features (webp)	35s
	30m 1s

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