Ben Wiederhake 4332dfb964 LibGfx: Fix dynamic bitmasks in BMPs ...

I overlooked a corner case where we might call the built-in ctz() on zero.

Furthermore, the calculation of the shift was wrong and the results were often
unusable.

Both issue were caused by a forgotten 36daeee34f.
This time I made sure to look at bmpsuite_files first, and now they look good.

Found by OSS-Fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28985

2021-01-30 09:23:18 +01:00

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