tcp: fix handling of retransmitted syns

Change-Id: I88fdeb0ca56d3a5d9c0f36def13c6de8142f59f0
Signed-off-by: Florin Coras <fcoras@cisco.com>
diff --git a/src/vnet/tcp/tcp_error.def b/src/vnet/tcp/tcp_error.def
index 0d6c44b..7bed10f 100644
--- a/src/vnet/tcp/tcp_error.def
+++ b/src/vnet/tcp/tcp_error.def
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Copyright (c) 2016-2019 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
@@ -26,6 +26,7 @@
 tcp_error (SEGMENT_OLD, "Old segment")
 tcp_error (SEGMENT_INVALID, "Invalid segments")
 tcp_error (SYNS_RCVD, "SYNs received")
+tcp_error (SPURIOUS_SYN, "Spurious SYNs received")
 tcp_error (SYN_ACKS_RCVD, "SYN-ACKs received")
 tcp_error (MSG_QUEUE_FULL, "Events not sent for lack of msg queue space") 
 tcp_error (CREATE_SESSION_FAIL, "Sessions couldn't be allocated")