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[Bug libc/18641] pwd.h: add __nonnull markings


https://sourceware.org/bugzilla/show_bug.cgi?id=18641

--- Comment #4 from Mike Frysinger <vapier at gentoo dot org> ---
(In reply to Florian Weimer from comment #3)

i missed the code doing the checking for this specific func.  i'll revert the
markings for it due to the release being close.  however i'm not sure the NULL
checks are useful at all and it would be better to penalize bad usage here.  do
you have an example of where this functionality is actually useful ?

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