qcacld-3.0: Fix null pointer dereference in wma_pdev_div_info_evt_handler

pmac->sme.get_chain_rssi_cb is never checked if
WMI_PDEV_DIV_RSSI_ANTID_EVENTID messages is sent anytime
by user.

pmac->sme.get_chain_rssi_cb can not be appropriately
registered and can result in NULL pointer dereference.

Change-Id: I64783a0e2d054b45678f126b42de20470d3264d3
CRs-Fixed: 2324128
1 file changed