Fix #77431 SplFileInfo::__construct() accepts NUL bytes

`SplFileInfo::__construct()` has to expect a path instead of a string,
analogous to `SplFileObject::__construct()`.

Author: cmb69

ext/spl/spl_directory.c

@@ -1110,7 +1110,7 @@ SPL_METHOD(SplFileInfo, __construct)
 	char *path;
 	size_t len;
 
-	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "s", &path, &len) == FAILURE) {
+	if (zend_parse_parameters_throw(ZEND_NUM_ARGS(), "p", &path, &len) == FAILURE) {
 		return;
 	}
 

ext/spl/tests/bug77431.phpt

@@ -0,0 +1,9 @@
+--TEST--
+Bug #77431 (SplFileInfo::__construct() accepts NUL bytes)
+--FILE--
+<?php
+new SplFileInfo("bad\0good");
+?>
+--EXPECTF--
+Fatal error: Uncaught TypeError: SplFileInfo::__construct() expects parameter 1 to be a valid path, string given in %s:%d
+Stack trace:%A