removed deprecated session check, which blocked file upload in some cases

files/ajax/upload.php

@@ -19,10 +19,8 @@ $source=$_FILES['file']['tmp_name'];
 $dir = $_POST['dir'];
 if(!empty($dir)) $dir .= '/';
 $target='/' . stripslashes($dir) . $fileName;
-if(isset($_SESSION['username'])
-and $_SESSION['username'] and strpos($dir,'..') === false){
+if(strpos($dir,'..') === false){
 	if(OC_FILESYSTEM::fromUploadedFile($source,$target)){
-// 	if(OC_FILES::move(dirname($source),basename($source), $dir, $fileName)){
 		echo json_encode(array( "status" => "success"));
 		exit();
 	}