Index: wp-includes/feed.php
===================================================================
--- wp-includes/feed.php	(revision 24381)
+++ wp-includes/feed.php	(working copy)
@@ -324,7 +324,7 @@
 		if ( 'rdf' == $type )
 			$the_list .= "\t\t<dc:subject><![CDATA[$cat_name]]></dc:subject>\n";
 		elseif ( 'atom' == $type )
-			$the_list .= sprintf( '<category scheme="%1$s" term="%2$s" />', esc_attr( apply_filters( 'get_bloginfo_rss', get_bloginfo( 'url' ) ) ), esc_attr( $cat_name ) );
+			$the_list .= sprintf( '<category scheme="%1$s" term="%2$s" />', esc_attr( get_bloginfo_rss( 'url' ) ), esc_attr( $cat_name ) );
 		else
 			$the_list .= "\t\t<category><![CDATA[" . @html_entity_decode( $cat_name, ENT_COMPAT, get_option('blog_charset') ) . "]]></category>\n";
 	}