libbinder_ndk's addService ((warn_unused_result))

Bug: 179713096
Test: mma
Change-Id: I52daf67faa7e9a519115c3910b186f9a3356955e
diff --git a/libs/binder/ndk/include_platform/android/binder_manager.h b/libs/binder/ndk/include_platform/android/binder_manager.h
index 2784aa8..e13d4cc 100644
--- a/libs/binder/ndk/include_platform/android/binder_manager.h
+++ b/libs/binder/ndk/include_platform/android/binder_manager.h
@@ -31,7 +31,8 @@
  *
  * \return EX_NONE on success.
  */
-binder_exception_t AServiceManager_addService(AIBinder* binder, const char* instance);
+__attribute__((warn_unused_result)) binder_exception_t AServiceManager_addService(
+        AIBinder* binder, const char* instance);
 
 /**
  * Gets a binder object with this specific instance name. Will return nullptr immediately if the
diff --git a/libs/binder/ndk/tests/binderVendorDoubleLoadTest.cpp b/libs/binder/ndk/tests/binderVendorDoubleLoadTest.cpp
index ad78e31..f3cd218 100644
--- a/libs/binder/ndk/tests/binderVendorDoubleLoadTest.cpp
+++ b/libs/binder/ndk/tests/binderVendorDoubleLoadTest.cpp
@@ -163,7 +163,8 @@
 
     // LOCAL SERVERS
     std::shared_ptr<NdkServer> ndkServer = SharedRefBase::make<NdkServer>();
-    AServiceManager_addService(ndkServer->asBinder().get(), kLocalNdkServerName.c_str());
+    CHECK(STATUS_OK ==
+          AServiceManager_addService(ndkServer->asBinder().get(), kLocalNdkServerName.c_str()));
 
     return RUN_ALL_TESTS();
 }