fix crash when notification timeout is received

coreapi/bellesip_sal/sal_op_publish.c

@@ -32,7 +32,7 @@ static void publish_refresher_listener (belle_sip_refresher_t* refresher
 	}else if (status_code>=200){
 		belle_sip_header_t *sip_etag;
 		const char *sip_etag_string = NULL;
-		if ((sip_etag = belle_sip_message_get_header(BELLE_SIP_MESSAGE(response), "SIP-ETag"))) {
+		if (response && (sip_etag = belle_sip_message_get_header(BELLE_SIP_MESSAGE(response), "SIP-ETag"))) {
 			sip_etag_string = belle_sip_header_get_unparsed_value(sip_etag);
 		}
 		sal_op_set_entity_tag(op, sip_etag_string);

coreapi/presence.c

@@ -1460,7 +1460,7 @@ static LinphonePresenceModel * process_pidf_xml_presence_notification(xmlparsing
 
 
 void linphone_core_add_subscriber(LinphoneCore *lc, const char *subscriber, SalOp *op){
-	LinphoneFriend *fl=linphone_friend_new_with_address(subscriber);
+	LinphoneFriend *fl=linphone_core_create_friend_with_address(lc,subscriber);
 	char *tmp;
 	
 	if (fl==NULL) return ;