Remove unused variable

Change-Id: I267b7743baa0980800271f4868f48c8720166191
diff --git a/aos/events/logging/logger_main.cc b/aos/events/logging/logger_main.cc
index b1dce96..1d0c55e 100644
--- a/aos/events/logging/logger_main.cc
+++ b/aos/events/logging/logger_main.cc
@@ -22,7 +22,6 @@
 
   aos::ShmEventLoop event_loop(&config.message());
 
-  std::unique_ptr<aos::logger::DetachedBufferWriter> writer;
   std::unique_ptr<aos::logger::LogNamer> log_namer;
   if (event_loop.node() == nullptr) {
     log_namer = std::make_unique<aos::logger::LocalLogNamer>(