bpo-32869: Fix incorrect dst buffer size for MultiByteToWideChar (#5739)

This function expects the destination buffer size to be given in wide characters, not bytes.

Author: izbyshev

Python/fileutils.c

@@ -1289,7 +1289,8 @@ _Py_fopen_obj(PyObject *path, const char *mode)
  if (wpath == NULL)
  return NULL;
 
- usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
+ usize = MultiByteToWideChar(CP_ACP, 0, mode, -1,
+ wmode, Py_ARRAY_LENGTH(wmode));
  if (usize == 0) {
  PyErr_SetFromWindowsErr(0);
  return NULL;