qcacld-3.0: validate wmi_handle before dereferencing

wmi_handle is retrieved from psoc handle, validate the same before
dereferencing to avoid any invalid access.

Change-Id: I58c566e1b94c5ba2cd4d74ad4406545ffb39e36e
CRs-Fixed: 3434869

core/wma/src/wma_main.c

@@ -7213,6 +7213,8 @@ int wma_rx_service_ready_ext_event(void *handle, uint8_t *event,
 		return -EINVAL;
 
 	wmi_handle = get_wmi_unified_hdl_from_psoc(wma_handle->psoc);
+	if (wmi_validate_handle(wmi_handle))
+		return -EINVAL;
 
 	tgt_hdl = wlan_psoc_get_tgt_if_handle(wma_handle->psoc);
 	if (!tgt_hdl) {