Issue4905: use INVALID_FILE_ATTRIBUTES where appropriate. (Patch by Ulrich Eckhardt)

Misc/ACKS

@@ -342,6 +342,7 @@ Maxim Dzumanenko
 Walter Dörwald
 Hans Eckardt
 Rodolpho Eckhardt
+Ulrich Eckhardt
 David Edelsohn
 John Edmonds
 Grant Edwards

Modules/posixmodule.c

@@ -2666,7 +2666,7 @@ os_access_impl(PyObject *self, path_t *path, int mode, int dir_fd, int effective
      * (Directories cannot be read-only on Windows.)
     */
     return_value = PyBool_FromLong(
-        (attr != 0xFFFFFFFF) &&
+        (attr != INVALID_FILE_ATTRIBUTES) &&
             (!(mode & 2) ||
             !(attr & FILE_ATTRIBUTE_READONLY) ||
             (attr & FILE_ATTRIBUTE_DIRECTORY)));
@@ -2938,7 +2938,7 @@ posix_chmod(PyObject *self, PyObject *args, PyObject *kwargs)
         attr = GetFileAttributesW(path.wide);
     else
         attr = GetFileAttributesA(path.narrow);
-    if (attr == 0xFFFFFFFF)
+    if (attr == INVALID_FILE_ATTRIBUTES)
         result = 0;
     else {
         if (mode & _S_IWRITE)