kientzle d686b7f3d6 POSIX prohibits any library function from setting errno to 0.
Correct my previous commit and add a comment to the manpage
indicating that the user must set errno to 0 if they wish to
distinguish "no such user" from "error".

Pointed out by: Jacques Vidrine (nectar@)
2004-05-17 18:27:05 +00:00
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