New J2K: Fix existing test data

nj2k/testData/newJ2k/function/java8Lambdas.java

@@ -28,7 +28,7 @@ public class Java8Class {
         foo1((Integer i) -> {
             helper();
             if (i > 1) {
-                return "42";
+                return null;
             }
 
             return "43";

nj2k/testData/newJ2k/function/java8Lambdas.kt

@@ -7,7 +7,7 @@
 class Java8Class {
     fun foo0(r: Function0<String>) {}
 
-    fun foo1(r: Function1<Int, String>) {}
+    fun foo1(r: Function1<Int, String?>) {}
 
     fun foo2(r: Function2<Int, Int, String>) {}
 

nj2k/testData/newJ2k/function/varVararg.kt

@@ -2,7 +2,7 @@ package demo
 
 internal class Test {
     fun test(vararg args: Any?) {
-        var argsx = args
+        var args = args
         args = arrayOf(1, 2, 3)
     }
 }