Lucas CHOLLET fb81668d8f LibGfx/JPEGLoader: Check earlier for quantization tables presence ...

This patch brings few small QoL improvements:
 - We don't need to read the Huffman stream before returning an error
   due to a missing quantization table.
 - We check the table presence only once per scan instead of once per
   MCU.
 - `dequantize()` is now infallible.

2024-02-26 20:13:25 +00:00

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