agent: Fixing panic on shutdown

command/agent/http.go

@@ -179,7 +179,7 @@ func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
 // Shutdown is used to shutdown the HTTP server
 func (s *HTTPServer) Shutdown() {
 	if s != nil {
-		s.logger.Printf("[DEBUG] http: Shutting down http server(%v)", s.addr)
+		s.logger.Printf("[DEBUG] http: Shutting down http server (%v)", s.addr)
 		s.listener.Close()
 	}
 }

command/agent/scada.go

@@ -141,7 +141,6 @@ func (s *scadaListener) Close() error {
 		return nil
 	}
 	s.closed = true
-	close(s.pending)
 	close(s.closedCh)
 	return nil
 }