Fix overflows #1027

Job	Run time
Fuzz targets (cargo-fuzz)	8m 50s
Fuzz targets (afl)	2m 24s
cargo-deny	27s
build_benchmarks	1m 36s
clippy	4m 32s
public_private_dependencies	31s
rustfmt	9s
test_avif	3m 7s
test_avif_decoding	2m 9s
test_big_endian	1m 24s
test_features	39s
test_big_endian (default)	2m 43s
test_toolchains (1.61.0)	10m 53s
test_features (default)	1m 37s
verify_msrv	4m 42s
test_big_endian (webp)	1m 43s
test_toolchains (nightly)	2m 21s
test_features (gif)	53s
test_toolchains (beta)	1m 21s
test_features (jpeg)	46s
test_big_endian (webp-encoder)	3m 16s
test_features (png)	48s
test_features (tiff)	59s
test_features (ico)	55s
test_features (pnm)	57s
test_features (tga)	1m 13s
test_features (webp)	54s
test_features (bmp)	43s
test_features (hdr)	54s
test_features (dxt)	38s
test_features (dds)	59s
test_features (farbfeld)	46s
test_features (openexr)	1m 3s
test_features (jpeg_rayon)	52s
test_features (webp-encoder)	2m 0s
	1h 9m 44s

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