Global: Cleanup initialization/pointer checks.

Cleaning up a lot of cases of uninitialized data, unchecked return values
for failures, and similar.

Common/Math/expression_parser.cpp

@@ -406,8 +406,8 @@ bool parsePostfixExpression(PostfixExpression& exp, IExpressionFunctions* funcs,
 	size_t num = 0;
 	uint32_t opcode;
 	std::vector<uint32_t> valueStack;
-	unsigned int arg[5];
-	float fArg[5];
+	unsigned int arg[5]{};
+	float fArg[5]{};
 	bool useFloat = false;
 
 	while (num < exp.size())