Make sure permalink has trailing slash before appending "trackback/" in trackback_url().

git-svn-id: http://svn.automattic.com/wordpress/trunk@838 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/template-functions-comment.php

@@ -260,7 +260,7 @@ function trackback_url($display = true) {
     $tb_url = $siteurl.'/wp-trackback.php/'.$id;
 
     if ('' != get_settings('permalink_structure')) {
-        $tb_url = get_permalink() . 'trackback/';
+        $tb_url = trailingslashit(get_permalink()) . 'trackback/';
     }
 
     if ($display) {
@@ -290,4 +290,4 @@ function trackback_rdf($timezone = 0) {
     }
 }
 
-?>
+?>