dholland f86ebf3938 Don't print junk errnos. Avoids: ...

% ps -tfoo
  ps: /dev/ttyfoo: Undefined error: 0
  Exit 1

2014-06-28 17:32:27 +00:00

..

extern.h

…

fmt.c

…

keyword.c

…

Makefile

…

nlist.c

…

print.c

…

ps.1

…

ps.c

Don't print junk errnos. Avoids:

2014-06-28 17:32:27 +00:00

ps.h

…