[draw] Fix leak from e0a5231657a6f09ca4afc93e1b2224eba7a0b544
diff --git a/src/hb-draw.cc b/src/hb-draw.cc
index a73dc29..46797e6 100644
--- a/src/hb-draw.cc
+++ b/src/hb-draw.cc
@@ -209,6 +209,9 @@
 #undef HB_DRAW_FUNC_IMPLEMENT
   }
 
+  hb_free (dfuncs->destroy);
+  hb_free (dfuncs->user_data);
+
   hb_free (dfuncs);
 }