fix uploading files using webdav

lib/fileproxy/quota.php

@@ -45,7 +45,7 @@ class OC_FileProxy_Quota extends OC_FileProxy{
 
 	public function preFile_put_contents($path,$data){
 		if (is_resource($data)) {
-			$data = stream_get_contents($data);
+			$data = '';//TODO: find a way to get the length of the stream without emptying it
 		}
 		return (strlen($data)<$this->getFreeSpace() or $this->getFreeSpace()==0);
 	}