inetd: do not trash errno in signal handlers;

inetd: do not trash errno in signal handlers;
 in CHLD handler, stop looping through services when pid is found

function                                             old     new   delta
reread_config_file                                  1072    1092     +20
retry_network_setup                                   55      69     +14
reap_child                                           132     130      -2