[subset] Actually subset GDEF
diff --git a/src/hb-subset.cc b/src/hb-subset.cc
index 1a6a5e0..9ce0a72 100644
--- a/src/hb-subset.cc
+++ b/src/hb-subset.cc
@@ -189,6 +189,9 @@
     case HB_OT_TAG_VORG:
       result = _subset<const OT::VORG> (plan);
       break;
+    case HB_OT_TAG_GDEF:
+      result = _subset2<const OT::GDEF> (plan);
+      break;
     case HB_OT_TAG_GSUB:
       result = _subset2<const OT::GSUB> (plan);
       break;