Fix fuzzer build.

Change-Id: I77657a849adc583e0fe09fb5e26d92a68d4bdebf
diff --git a/test/end_to_end_shared_memory_fuzzer.cc b/test/end_to_end_shared_memory_fuzzer.cc
index bdc28e5..3c32409 100644
--- a/test/end_to_end_shared_memory_fuzzer.cc
+++ b/test/end_to_end_shared_memory_fuzzer.cc
@@ -76,8 +76,8 @@
 
   void OnDisconnect() override {}
 
-  void SetupDataSource(DataSourceInstanceID,
-                       const DataSourceConfig& source_config) override {}
+  void SetupDataSource(DataSourceInstanceID, const DataSourceConfig&) override {
+  }
 
   void StartDataSource(DataSourceInstanceID,
                        const DataSourceConfig& source_config) override {