[SSSD] [PATCH] Verify LDAP file descriptor validity

[Stephen Gallagher]

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We weren't verifying that the file descriptor that we get back from
openldap was valid. This patch checks that the file descriptor is >= 0
before returning it.

There's another (arguable) bug here in libtevent. Libtevent should
probably not return success for tevent_add_fd() when fd < 0 (especially
since it crashes). I'll open a bug upstream.

Fixes https://fedorahosted.org/sssd/ticket/797 and
https://bugzilla.redhat.com/show_bug.cgi?id=676027

- -- 
Stephen Gallagher
RHCE 804006346421761

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