Callback elision for HIDL interfaces.

Test: mma, hidl_test
Bug: 31380743
Change-Id: Ic5390d49a9493d1180bdd8a15bc47e891637890e
diff --git a/tests/bar/1.0/default/Bar.cpp b/tests/bar/1.0/default/Bar.cpp
index 4152bb9..16c0235 100644
--- a/tests/bar/1.0/default/Bar.cpp
+++ b/tests/bar/1.0/default/Bar.cpp
@@ -165,10 +165,8 @@
     return Void();
 }
 
-Return<void> Bar::haveAInterface(const sp<ISimple> &in,
-            haveAInterface_cb _hidl_cb) {
-    _hidl_cb(in);
-    return Void();
+Return<sp<ISimple>> Bar::haveAInterface(const sp<ISimple> &in) {
+    return in;
 }