message: Fix Redox fchdir
diff: @@ -283,11 +283,12 @@ impl Pal for Sys {
  }
  fn fchdir(fd: c_int) -> c_int {
  - let path: &mut [u8] = &mut [0; 4096];
  - if e(syscall::fpath(fd as usize, path)) == !0 {
  + let mut buf = [0; 4096];
  + let res = e(syscall::fpath(fd as usize, &mut buf));
  + if res == !0 {
  !0
  } else {
  - e(syscall::chdir(path)) as c_int
  + e(syscall::chdir(&buf[..res])) as c_int
  }
  }
  