core: fix type inference StackOverflowError

jadx-core/src/main/java/jadx/core/clsp/ClspGraph.java

@@ -120,11 +120,13 @@ public class ClspGraph {
 	}
 
 	private void addAncestorsNames(NClass cls, Set<String> result) {
-		result.add(cls.getName());
+		boolean isNew = result.add(cls.getName());
+		if (isNew) {
 			for (NClass p : cls.getParents()) {
 				addAncestorsNames(p, result);
 			}
 		}
+	}
 
 	public void printMissingClasses() {
 		int count = missingClasses.size();