Callback: removed workaround for HHVM

Author: dg

src/Utils/Callback.php

@@ -89,9 +89,6 @@ public static function invokeArgs($callable, array $args = [])
 	public static function invokeSafe(string $function, array $args, callable $onError)
 	{
 		$prev = set_error_handler(function ($severity, $message, $file) use ($onError, &$prev, $function) {
-			if ($file === '' && defined('HHVM_VERSION')) { // https://github.com/facebook/hhvm/issues/4625
-				$file = func_get_arg(5)[1]['file'];
-			}
 			if ($file === __FILE__) {
 				$msg = preg_replace("#^$function\(.*?\): #", '', $message);
 				if ($onError($msg, $severity) !== false) {