In target_if_get_roam_vendor_control_param_event_handler,
there are 2 possible NULL pointer dereference issues:
1. Host calls target_if_get_psoc_from_scn_hdl API to get
psoc object. But as per current logic even if psoc is
NULL, psoc is dereferenced by passing it as an argument
to get_wmi_unified_hdl_from_psoc.
2. Host calls get_wmi_unified_hdl_from_psoc API to get
wmi_handle pointer. But as per current logic even if
wmi_handle is NULL, wmi_handle is dereferenced by
passing is as an argument 1 to function
wmi_extract_roam_vendor_control_param_event.
Fix is to update the sanity check logic for psoc and
wmi_handle pointers to avoid possible NULL pointer
dereference.
Change-Id: I3c3df062b538b05218e729d7bf6806e221073269
CRs-Fixed: 3242435
f66512e051