Make integration test work again after refactoring

Author: thekid

src/main/php/peer/ftp/FtpTransfer.class.php

@@ -47,10 +47,10 @@ public function getRemote() {
   /**
    * Returns the remote file
    *
-   * @param  peer.ftp.FtpTransferListener $l
+   * @param  ?peer.ftp.FtpTransferListener $l
    * @return self
    */
-  public function withListener(FtpTransferListener $l= null) {
+  public function withListener(?FtpTransferListener $l= null) {
     $this->listener= $l;
     return $this;
   }

src/main/php/peer/ftp/server/FtpProtocol.class.php

@@ -764,7 +764,7 @@ public function onRnfr($socket, $params) {
       $this->answer($socket, 550, $params.': No such file or directory');
       return;
     }
-    $this->cat && $this->cat->debug($entry->toString());
+    $this->cat && $this->cat->debug($entry);
 
     $this->sessions[$socket->hashCode()]->setTempVar('rnfr', $entry);
     $this->answer($socket, 350, 'File or directory exists, ready for destination name.');