Fix typo.

Change-Id: If3a646b2670f9804386fb53990573308323c6e3a
diff --git a/room/huette3b.c b/room/huette3b.c
index c73b1da..91f4819 100644
--- a/room/huette3b.c
+++ b/room/huette3b.c
@@ -29,5 +29,5 @@
 int westen() {
   tell_room(TO, BSLF(
     "Ein Sack Reis kippt um."));
-  return TP->move(__DIR__"huette3b", M_GO);
+  return TP->move(__DIR__"huette3a", M_GO);
 }