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fix syslogd busyloop

Caleb Connolly requested to merge caleb/ttynull-fix into master

when stdin is /dev/null (e.g. when console=null is on the kernel cmdline) syslogd will call read() over and over and never handle the SIGTERM we send it, pinning a CPU core on every boot.

Fixes: #3269 (closed)

Edited by Clayton Craft

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