case when it is forced by -oMa. However, we must flag that it isn't a socket,
so that the test for IP options is skipped for -bs input. */
-if (sender_host_address != NULL && sender_fullhost == NULL)
+if (sender_host_address && !sender_fullhost)
{
host_build_sender_fullhost();
set_process_info("handling incoming connection from %s via -oMa",