[subset] Fix memory leak in hb-subset-glyf.
diff --git a/src/hb-subset-glyf.cc b/src/hb-subset-glyf.cc
index d57b411..d29efe9 100644
--- a/src/hb-subset-glyf.cc
+++ b/src/hb-subset-glyf.cc
@@ -234,6 +234,8 @@
                                           use_short_loca,
                                           glyf_prime,
                                           loca_prime);
+
+  hb_blob_destroy (glyf_blob);
   glyf.fini();
 
   return result;