fix OER NULL and SEQUENCE extensions round-trip
diff --git a/skeletons/oer_encoder.h b/skeletons/oer_encoder.h
index 252bd6a..6a7b681 100644
--- a/skeletons/oer_encoder.h
+++ b/skeletons/oer_encoder.h
@@ -48,8 +48,8 @@
/*
* Write out the Open Type (X.696 (08/2015), #30).
* RETURN VALUES:
- * -1: Fatal error encoding the type.
- * >=0: Number of bytes serialized.
+ * -1: Fatal error encoding the type.
+ * >0: Number of bytes serialized.
*/
ssize_t oer_open_type_put(const struct asn_TYPE_descriptor_s *td,
const asn_oer_constraints_t *constraints,