Manual update for get.*_r functions

[Ulrich Drepper]

Andreas Jaeger <aj@arthur.rhein-neckar.de> writes:

> I'm appending a patch for the manual to document the POSIX behaviour
> to summarize my understanding of the issue.

The test for a NULL pointer should not be necessary.  Where did you
find this necessary?  It is then a bug in the NSS backend.

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