don't handle PeerTest 1 with same nonce twice

libi2pd/SSU2Session.cpp

@@ -2162,7 +2162,8 @@ namespace transport
 					GetRemoteIdentity ()->GetIdentHash ());
 				if (session) // session with Charlie
 				{
-					m_Server.AddPeerTest (nonce, shared_from_this (), ts/1000);
+					if (m_Server.AddPeerTest (nonce, shared_from_this (), ts/1000))
+					{	
 						auto packet = m_Server.GetSentPacketsPool ().AcquireShared ();
 						// Alice's RouterInfo
 						auto r = i2p::data::netdb.FindRouter (GetRemoteIdentity ()->GetIdentHash ());
@@ -2186,6 +2187,9 @@ namespace transport
 						packet->sendTime = ts;
 						session->m_SentPackets.emplace (packetNum, packet);
 					}
+					else
+						LogPrint (eLogInfo, "SSU2: Peer test 1 nonce ", nonce, " already exists. Ignored");
+				}
 				else
 				{
 					// Charlie not found, send error back to Alice