inetd: use snprintf() in inetd_setproctitle()

[ojanerif_amd.com]

Summary

inetd_setproctitle() formats se_service (the service name taken verbatim
from inetd.conf) and the peer address into an 80-byte buffer with
sprintf(). A long service name can overflow it. Bound both calls with
snprintf(). Build-tested; no functional change.

MFC after: 1 week