Don't discard result of checking grouptype

Don't discard result of checking grouptype

The pdb_samba_dsdb_getgrfilter() function first determines the security type
of a group and sets map->sid_name_use accordingly. A little later, this
variable is set again, undoing the previous work.

https://bugzilla.samba.org/show_bug.cgi?id=10777

Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Simo Sorce <idra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Aug 23 02:48:52 CEST 2014 on sn-devel-104