Fix avif odd width/height handling #1199

Job	Run time
test_features	23s
test_features (default)	1m 36s
test_features (gif)	49s
Fuzz targets (afl)	1m 31s
test_features (jpeg)	26s
build_benchmarks	45s
Fuzz targets (cargo-fuzz)	5m 19s
test_features (png)	30s
test_features (tiff)	28s
clippy	2m 19s
test_features (ico)	32s
public_private_dependencies	16s
rustfmt	15s
test_features (pnm)	29s
test_avif	1m 10s
test_features (tga)	25s
test_avif_decoding	2m 1s
test_features (webp)	32s
test_features (bmp)	30s
test_other_archs (powerpc-unknown-linux-gnu, default)	4m 18s
test_toolchains (1.61.0)	44s
test_features (hdr)	28s
test_other_archs (powerpc-unknown-linux-gnu, webp-encoder)	1m 59s
test_toolchains (nightly)	1m 37s
test_features (dxt)	28s
test_other_archs (i686-unknown-linux-gnu, default)	1m 52s
test_features (dds)	27s
test_toolchains (beta)	1m 38s
test_other_archs (i686-unknown-linux-gnu, webp-encoder)	1m 18s
test_features (farbfeld)	22s
verify_msrv	3m 35s
test_features (openexr)	44s
cargo-deny	23s
test_features (jpeg_rayon)	30s
test_features (webp-encoder)	1m 0s
	41m 39s

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