gad 942a2225b3 Fix so `ps' catches and complains about null-values specified for a
process id, instead of using pid==0.  Ie, `ps -p 12,' and `ps -p ,12'
are now errors (instead of being treated like `ps -p 0 -p 12').

Noticed by:	Cyrille Lefevre on freebsd-arch
2004-06-01 03:01:51 +00:00
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