openflow_input: fix port stats reply entry
diff --git a/openflow_input/standard-1.4 b/openflow_input/standard-1.4
index ea1c6fe..0715ca7 100644
--- a/openflow_input/standard-1.4
+++ b/openflow_input/standard-1.4
@@ -1534,6 +1534,8 @@
     uint16_t length;
     pad(2);
     of_port_no_t port_no;
+    uint32_t duration_sec;
+    uint32_t duration_nsec;
     uint64_t rx_packets;
     uint64_t tx_packets;
     uint64_t rx_bytes;
@@ -1542,8 +1544,6 @@
     uint64_t tx_dropped;
     uint64_t rx_errors;
     uint64_t tx_errors;
-    uint32_t duration_sec;
-    uint32_t duration_nsec;
     list(of_port_stats_prop_t) properties;
 };