Annotate missing break statement

New compiler I'm working on switching to points this out.

Change-Id: I49023c2e5d4df48b06d1cc156687d8c93375ded7
diff --git a/motors/seems_reasonable/spring.cc b/motors/seems_reasonable/spring.cc
index 1127aa9..4448b33 100644
--- a/motors/seems_reasonable/spring.cc
+++ b/motors/seems_reasonable/spring.cc
@@ -62,6 +62,8 @@
         goal_ = NextGoal(kLoadGoal);
         Load();
       }
+      // TODO(Austin): This should be a break, right?
+      // fallthrough
     case State::STUCK_UNLOAD:
       if (force_move) {
         ForceMove();