PVS-Studio warning V576 for Chromium

DWORD GetLastError(VOID);

void TryOpenFile(wchar_t *path, FILE *output) {
  wchar_t path_expanded[MAX_PATH] = {0};
  DWORD size = ::ExpandEnvironmentStrings(
    path, path_expanded, MAX_PATH - 1);
  if (!size) {
    fprintf(output,
            "[ERROR] Cannot expand \"%S\". Error %S.\r\n",
            path, ::GetLastError());
  }
  ....
}

This suspicious code was found in Chromium project by PVS-Studio static code analyzer.
Warning message is:
V576 Incorrect format. Consider checking the fourth actual argument of the 'fprintf' function. The pointer to string of wchar_t type symbols is expected. fs.cc 17

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