Nico Weber 2452cf6b55 WebP/Lossy: Allow negative values from segment adjustment too ...

The spec doesn't talk about this happening in the text, but
`dequant_init()` in 20.4 processes segment adjustment and quantization
index adjustment in the same variable `q` before clamping.
Since we had to adjust the latter step in the previous commit, do
it for the former step too.

I haven't seen this happen in the wild yet (and now, I hopefully
never will notice it if it happens).

2023-06-01 17:36:20 +02:00

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