Now make_upload_directory() is used, avoiding dependencies to

backup/lib.php. I think that, gradually, I'll can modify the
backup/restore process to use this "core" function everywhere!!
Bug 1467.
(http://moodle.org/bugs/bug.php?op=show&bugid=1467)

admin/cron.php

@@ -149,7 +149,6 @@
 
     if (!empty($CFG->enablerssfeeds)) {  //Defined in admin/variables page
         if (file_exists("$CFG->dirroot/rss/rsslib.php")) {
-            include_once("$CFG->dirroot/backup/lib.php");    // Unfortunately this is required
             include_once("$CFG->dirroot/rss/rsslib.php");
             echo "Running rssfeeds if required...\n";
             flush();

rss/rsslib.php

@@ -92,22 +92,19 @@ function rss_save_file ($modname,$mod,$result) {
 
     $status = true;
 
-    $basedir = $CFG->dataroot."/rss";
-
-    //Check dataroot/rss exists
-    $status = check_dir_exists($basedir,true);
-
-    $basedir .= "/".$modname;
-
-    //Check dataroot/rrs/$modname exists
-    $status = check_dir_exists($basedir,true);
+    if (! $basedir = make_upload_directory ("rss/".$modname)) {
+        //Cannot be created, so error
+        $status = false;
+    }
 
     if ($status) {
         $file = $basedir .= "/".$mod->id.".xml";
         $rss_file = fopen($file,"w");
         if ($rss_file) {
             $status = fwrite ($rss_file,$result);
             fclose($rss_file);
+        } else {
+            $status = false;
         }
     }
     return $status;