[SSSD] [PATCH] Don't double-sanitize member DNs

[Stephen Gallagher]

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After asking the cache for the list of member DNs for groups
during an initgroups request, we were passing it through the
sanitization function. Since this had already been done before
they were saved to the cache, this meant that it was corrupting
the results. It is safe to pass the returned DN directly into the
sysdb_group_dn_name() function.

It also fixes the tevent_req_error() function to return the correct
value. I discovered this bug because the logs were reporting ENOMEM.

- -- 
Stephen Gallagher
RHCE 804006346421761

Delivering value year after year.
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