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594e450b3f
Namely, have off counted starting from 0 rather than from csstate->off. To compensate we need to shift the initial value (csstate->sum) (rotate by 8 bits, as usual for csum) and do the same after we are finished adding the pieces up. What we get out of that is a bit more redundancy in our variables - from is always equal to addr + off, which will be useful several commits down the road. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>