minor
diff --git a/src/hb-subset-cff-common.cc b/src/hb-subset-cff-common.cc
index b71ac57..c9a880a 100644
--- a/src/hb-subset-cff-common.cc
+++ b/src/hb-subset-cff-common.cc
@@ -68,8 +68,7 @@
   {
     /* use hb_set to determine the subset of font dicts */
     hb_set_t *set = hb_set_create ();
-    if (set == &Null (hb_set_t))
-      return false;
+    if (unlikely (set == &Null (hb_set_t))) return false;
     hb_codepoint_t prev_fd = CFF_UNDEF_CODE;
     for (hb_codepoint_t i = 0; i < subset_num_glyphs; i++)
     {