[getService] Only set binder when getService2() succeeds

To avoid crashing in the getService() call.

Bug: 387175643
Test: atest servicemanager_test
Change-Id: I8617e748fdb85e96ded4c59b5c7785be20de05ee

Author: Alice Wang

libs/binder/BackendUnifiedServiceManager.cpp

@@ -215,7 +215,9 @@ Status BackendUnifiedServiceManager::getService(const ::std::string& name,
                                                 sp<IBinder>* _aidl_return) {
     os::Service service;
     Status status = getService2(name, &service);
-    *_aidl_return = service.get<os::Service::Tag::serviceWithMetadata>().service;
+    if (status.isOk()) {
+        *_aidl_return = service.get<os::Service::Tag::serviceWithMetadata>().service;
+    }
     return status;
 }