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/y2012/control_loops/accessories/accessories.cc b/y2012/control_loops/accessories/accessories.cc
index 86105e9..4618b48 100644
--- a/y2012/control_loops/accessories/accessories.cc
+++ b/y2012/control_loops/accessories/accessories.cc
@@ -57,5 +57,5 @@
 
   event_loop.Run();
 
-  ::aos::Cleanup();
+  return 0;
 }
diff --git a/y2012/control_loops/drivetrain/drivetrain_main.cc b/y2012/control_loops/drivetrain/drivetrain_main.cc
index ad55b26..3bc9dce 100644
--- a/y2012/control_loops/drivetrain/drivetrain_main.cc
+++ b/y2012/control_loops/drivetrain/drivetrain_main.cc
@@ -21,6 +21,5 @@
 
   event_loop.Run();
 
-  ::aos::Cleanup();
   return 0;
 }
diff --git a/y2012/joystick_reader.cc b/y2012/joystick_reader.cc
index 4683b29..a40d148 100644
--- a/y2012/joystick_reader.cc
+++ b/y2012/joystick_reader.cc
@@ -162,5 +162,5 @@
 
   event_loop.Run();
 
-  ::aos::Cleanup();
+  return 0;
 }