Remove unused Cleanup() call

It was used to clean up shared memory.  We don't construct that anymore,
so remove the useless call.

Change-Id: I8087cef2afce184f66721a9995a63053fb278ec7
diff --git a/y2018/actors/autonomous_actor_main.cc b/y2018/actors/autonomous_actor_main.cc
index 76fae2e..e9d775b 100644
--- a/y2018/actors/autonomous_actor_main.cc
+++ b/y2018/actors/autonomous_actor_main.cc
@@ -14,6 +14,5 @@
   ::y2018::actors::AutonomousActor autonomous(&event_loop);
   event_loop.Run();
 
-  ::aos::Cleanup();
   return 0;
 }
diff --git a/y2018/control_loops/drivetrain/drivetrain_main.cc b/y2018/control_loops/drivetrain/drivetrain_main.cc
index c9fea5d..59c8c78 100644
--- a/y2018/control_loops/drivetrain/drivetrain_main.cc
+++ b/y2018/control_loops/drivetrain/drivetrain_main.cc
@@ -21,6 +21,5 @@
 
   event_loop.Run();
 
-  ::aos::Cleanup();
   return 0;
 }
diff --git a/y2018/control_loops/superstructure/superstructure_main.cc b/y2018/control_loops/superstructure/superstructure_main.cc
index f072c68..fb2d1e4 100644
--- a/y2018/control_loops/superstructure/superstructure_main.cc
+++ b/y2018/control_loops/superstructure/superstructure_main.cc
@@ -15,6 +15,5 @@
 
   event_loop.Run();
 
-  ::aos::Cleanup();
   return 0;
 }
diff --git a/y2018/joystick_reader.cc b/y2018/joystick_reader.cc
index c8c5385..91737e3 100644
--- a/y2018/joystick_reader.cc
+++ b/y2018/joystick_reader.cc
@@ -399,5 +399,5 @@
 
   event_loop.Run();
 
-  ::aos::Cleanup();
+  return 0;
 }