Fixed memory leaks pointed out by Clang #13
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Fixed potential memory leaks pointed out by the Clang static analyzer: • DTMultiExpressionPatch#compileSourceOfType:, `QCMathematicalExpression *expr` is released properly… unless the `error` condition is hit. Now `release`s before `continue`ing in the error case. • DTSampleHoldPatch#setState: The result of NSKeyedUnarchiver#unarchiveObjectWithData: is double-retained, once explicitly and then again by the retaining `priorValue` property. Removed the explicit retain.
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Fixed potential memory leaks pointed out by the Clang static analyzer:
• DTMultiExpressionPatch#compileSourceOfType:,
QCMathematicalExpression *expris released properly… unless theerrorcondition is hit. Nowreleases beforecontinueing in the error case.• DTSampleHoldPatch#setState: The result of NSKeyedUnarchiver#unarchiveObjectWithData: is double-retained, once explicitly and then again by the retaining
priorValueproperty. Removed the explicit retain.