[ssu2] close socket if it was opened on OpenSocket

Signed-off-by: R4SAS <r4sas@i2pmail.org>

libi2pd/SSU2.cpp

@@ -212,6 +212,8 @@ namespace transport
 		boost::asio::ip::udp::socket& socket = localEndpoint.address ().is_v6 () ? m_SocketV6 : m_SocketV4;
 		try
 		{
+			if (socket.is_open ())
+				socket.close ();
 			socket.open (localEndpoint.protocol ());
 			if (localEndpoint.address ().is_v6 ())
 				socket.set_option (boost::asio::ip::v6_only (true));