refs #1730: Fixed a bug in DivideExpression in order to use in munge.

http://source.rd.rcg.local/trac/eagle6/changeset/1431/Eagle6_SVN

lib/pipeline/expressions/DivideExpression.js

@@ -24,7 +24,7 @@ var DivideExpression = module.exports = (function(){
 
 	proto.addOperand = function addOperand(expr){
 		this.checkArgLimit(2);
-		base.addOperand.call(this, expr);
+		base.prototype.addOperand.call(this, expr);
 	};
 
 	/**