Revert "use readfile() instead iof fopen() for file download over webdav."

This reverts commit 9af74a9c80.

lib/connector/sabre/file.php

@@ -42,7 +42,7 @@ class OC_Connector_Sabre_File extends OC_Connector_Sabre_Node implements Sabre_D
 	 */
 	public function get() {
 
-		return OC_Filesystem::readfile($this->path);
+		return OC_Filesystem::fopen($this->path,'r');
 
 	}