qcacld-3.0: reject CoAP offload request for non-STA roles

Firmware supports CoAP offload for STA mode only in
current stage, reject the request for non-STA roles
to align with that.

Change-Id: Ifa43295d0e800b87d29342038d0a690966a2c238
CRs-Fixed: 3310910

core/hdd/src/wlan_hdd_coap.c

@@ -57,6 +57,9 @@ __wlan_hdd_cfg80211_coap_offload(struct wiphy *wiphy,
 	if (errno != 0)
 		return errno;
 
+	if (adapter->device_mode != QDF_STA_MODE)
+		return -ENOTSUPP;
+
 	vdev = hdd_objmgr_get_vdev_by_user(adapter, WLAN_COAP_ID);
 	if (!vdev)
 		return -EINVAL;