fix(ssh): fix nil segv

cmd/dpsproxy-server/components/GenerateRoute.html

@@ -17,8 +17,9 @@
   </div>
   <small
     >Do not share the long-lived token. A third party could re-use this token to
-    hijack the route. Fetching a new route will delete old tokens. Generated
-    token and established connections persist after the token is expired.</small
+    hijack the route. As a security measure, fetching a route will delete old
+    tokens. Note also that established connections persist after the token is
+    expired.</small
   >
   <input type="submit" value="Fetch route" />
 </form>

ssh/server.go

@@ -151,6 +151,7 @@ func (s *Server) Serve(ctx context.Context) error {
 			sshConn, chans, reqs, err := ssh.NewServerConn(conn, s.ServerConfig)
 			if err != nil {
 				log.Warn().Err(err).Msg("ssh failure")
+				return
 			}
 			defer sshConn.Close()
 			client := &client{