qcacld-3.0: Avoid use after free in csr_post_rso_stop

Req has been freed in csr_roam_send_rso_cmd when return faiure.
Avoid use after free and double free in csr_post_rso_stop.

Change-Id: I86e6360eed1a57d0bac218f799393fff0e2a4a58
CRs-Fixed: 2748399
1 file changed