Static analysis fixups
Line 114: Remove the potential divide by zero by considering that the only way to get xspace=0 is when yspace <= 1, in which case it's a unity grid. Line 295: Add some brackets to make the expression unambiguous. Fortunately with Norcroft ((thing & 1) == 1) results in the same output as (thing & (1 == 1)) in this situation. From a tip off in https://www.riscosopen.org/forum/forums/4/topics/3990 Version 1.29. Tagged as 'Draw-1_29'
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