Try to make Coverity understand that this struct telnet is used.

bin/varnishd/mgt/mgt_cli.c

@@ -550,6 +550,7 @@ mgt_cli_telnet(const char *T_arg)
 		tn->ev->fd = sock;
 		tn->ev->fd_flags = POLLIN;
 		tn->ev->callback = telnet_accept;
+		tn->ev->priv = tn;;
 		AZ(vev_add(mgt_evb, tn->ev));
 		free(ta[i]);
 		ta[i] = NULL;