Prism.closeDown: reset cuddStarted flag

Normally, this should not matter, but in case closeDown is called multiple times
(e.g., due to some nailgun stuff), this should avoid multiple CUDD shutdowns,
which would probably lead to hard crashes.



git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@11602 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/Prism.java

@@ -3617,6 +3617,8 @@ public class Prism extends PrismComponent implements PrismSettingsListener
 		// Close down CUDD/JDD
 		if (cuddStarted) {
 			JDD.CloseDownCUDD(check);
+			// reset CUDD status
+			cuddStarted = false;
 		}
 	}