tail(1) broken in 13-stable

[Peter Jeremy]

Since updating from 12-stable to 13-stable, I've found that tail(1)
crashes, reporting:
Assertion failed: (procfd > STDERR_FILENO), function service_clean, file /usr/src/lib/libcasper/libcasper/service.c, line 394.
tail: unable to init casper: Socket is not connected
unless all three of stdin, stdout and stderr are open.  Whilst it
probably doesn't make sense to call tail without stdout open. there's
no obvious reason to require that stdin or stderr must be open.

-- 
Peter Jeremy
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