qcacld-3.0: Fix null ptr dereference of session

Currently, lim_process_sme_disassoc_cnf,
lim_process_sme_disassoc_req, lim_process_sme_deauth_req and
sme_qos_request_reassoc does not do null validation for session
which can lead to null pointer derefrence.

Add null pointer check for session in lim_process_sme_disassoc_req,
lim_process_sme_deauth_req,lim_process_sme_disassoc_cnf and
sme_qos_request_reassoc before usage and send failure to sme.

Change-Id: I0efe4e98a8dd26767309ed1e6b668a6267a4b770
CRs-Fixed: 2423887
2 files changed