Java to Kotlin converter: more smartness about nullability

j2k/tests/testData/ast/nullability/MethodResultComparedWithNull4.java

@@ -0,0 +1,14 @@
+//file
+interface I {
+    String getString();
+}
+
+class C {
+    void foo(I i, boolean b) {
+        String result = i.getString();
+        if (b) result = null;
+        if (result != null) {
+            print(result);
+        }
+    }
+}