From 4fdb5bb93bb0375a4a1b1c5cfba90315f1afe9d4 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Nov 08 2016 13:34:23 +0000
Subject: __ntapi_tt_open_physical_parent_directory(): support device root directory.


---

diff --git a/src/fs/ntapi_tt_open_physical_parent_directory.c b/src/fs/ntapi_tt_open_physical_parent_directory.c
index a9975a7..e80a21a 100644
--- a/src/fs/ntapi_tt_open_physical_parent_directory.c
+++ b/src/fs/ntapi_tt_open_physical_parent_directory.c
@@ -39,9 +39,11 @@ int32_t __stdcall __ntapi_tt_open_physical_parent_directory(
 		return NT_STATUS_BAD_FILE_TYPE;
 
 	wch = path->buffer + (path->strlen / sizeof(uint16_t));
-	while ((--wch >= path->buffer) && (*wch != '\\'));
 
-	if (wch == path->buffer )
+	for (; (wch > path->buffer) && (wch[-1] != '\\'); wch--)
+		(void)0;
+
+	if (wch == path->buffer)
 		return NT_STATUS_MORE_PROCESSING_REQUIRED;
 
 	path->strlen = sizeof(uint16_t) * (uint16_t)(wch-path->buffer);