nss_db: protect against empty mappings

[Andreas Schwab]

On Jun 24 2019, DJ Delorie <dj@redhat.com> wrote:

> Andreas Schwab <schwab@suse.de> writes:
>> Then please add a comment that this call is only there to add a
>> dependency on libselinux.
>
> I did, in the v6 patch:
> https://www.sourceware.org/ml/libc-alpha/2019-06/msg00457.html

That comment does not quite say that.  It should say that it's a symbol
reference to the library (not a functional dependency).

Andreas.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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