possible fix for bombarding the server with the htaccess test during setup

lib/util.php

@@ -544,6 +544,11 @@ class OC_Util {
 
 		// creating a test file
 		$testfile = OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" ).'/'.$filename;
+
+		if(file_exists($testfile)){// already running this test, possible recursive call
+			return false;
+		}
+
 		$fp = @fopen($testfile, 'w');
 		@fwrite($fp, $testcontent);
 		@fclose($fp);