Fix in explicit model checker - remove dupe calls in bin-op check.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@4509 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/explicit/StateModelChecker.java

@@ -314,8 +314,6 @@ public class StateModelChecker
 				res1.clear();
 			throw e;
 		}
-		res1 = checkExpression(model, expr.getOperand1());
-		res2 = checkExpression(model, expr.getOperand2());
 		
 		// Apply operation
 		res1.applyBinaryOp(op, res2);