All usage of hdd_is_sta_authenticated() was removed by the patch:
qcacld-3.0: Code cleanup from HDD module
Change-Id If5f1cf432b5c02848202debee7de696b2f20be9a
Since hdd_is_sta_authenticated() is unused, remove it.
Change-Id: I777b8bb1ecda596d71744aa62be4b14dba71fe0e
CRs-Fixed: 3428727