get feed_id from article ref_id in outputArticleXML()

functions.php

@@ -3401,6 +3401,14 @@
 
 	function outputArticleXML($link, $id, $feed_id, $mark_as_read = true) {
 
+		/* we can figure out feed_id from article id anyway, why do we
+		 * pass feed_id here? */
+
+		$result = db_query($link, "SELECT feed_id FROM ttrss_user_entries
+			WHERE ref_id = '$id'");
+
+		$feed_id = db_fetch_result($result, 0, "feed_id");
+
 		print "<article id='$id'><![CDATA[";
 
 		$result = db_query($link, "SELECT rtl_content FROM ttrss_feeds