Java to Kotlin converter: correct code generated for accessing nullable variables

j2k/tests/testData/ast/nullability/NullableVariableDotAccess.java

@@ -0,0 +1,6 @@
+//method
+int foo(String s, boolean b) {
+  if (s == null) System.out.println("null")
+  if (b) return s.length();
+  return 10;
+}

j2k/tests/testData/ast/nullability/NullableVariableDotAccess.kt

@@ -0,0 +1,7 @@
+fun foo(s: String?, b: Boolean): Int {
+    if (s == null)
+        System.out.println("null")
+    if (b)
+        return s?.length()!!
+    return 10
+}