[ENOMEM] check for error in visited map during closure features.

src/hb-ot-layout-gsubgpos.hh

diff --git a/src/hb-ot-layout-gsubgpos.hh b/src/hb-ot-layout-gsubgpos.hh
index 8223038..03a578c 100644
--- a/src/hb-ot-layout-gsubgpos.hh
+++ b/src/hb-ot-layout-gsubgpos.hh
@@ -89,6 +89,9 @@
 
   bool is_lookup_done (unsigned int lookup_index)
   {
+    if (done_lookups->in_error ())
+      return true;
+
     /* Have we visited this lookup with the current set of glyphs? */
     return done_lookups->get (lookup_index) == glyphs->get_population ();
   }