Remove unnecessary checks from liquidityMathAddDelta function
#168
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Description
When the result(
z) became negative is generally due to the incorrect input values. For example, ifxis negative andyis a positive number that is less than the absolute value of that negative number (e.g., x=-100, y=50). Here,zturn out to be negative value(-50). Another case is when both input values are negative.So I think it's sufficient to simply check that
zis negative.