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Fix the ZFS checksum error histograms with larger record sizes
My analysis in PR openzfs#14716 was incorrect. Each histogram bucket contains the number of incorrect bits, by position in a 64-bit word, over the entire record. 8-bit buckets can overflow for record sizes above 2k. To forestall that, saturate each bucket at 255. That should still get the point across: either all bits are equally wrong, or just a couple are. Sponsored-by: Axcient Signed-off-by: Alan Somers <asomers@gmail.com>
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