Do not leak hb_language_t on hb_language_item_t destruction
diff --git a/src/hb-common.cc b/src/hb-common.cc
index 8837cef..05a1f9c 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -265,6 +265,7 @@
   *lang = key;
 
   if (!hb_atomic_ptr_cmpexch (&langs, first_lang, lang)) {
+    lang->finish ();
     free (lang);
     goto retry;
   }