message: Simplify cstr_from_bytes_with_nul_unchecked()
  The original implementation is modified from the `Cstr` method, but the
  complexity there exists because it is trying to convert to the DST `Cstr`.
diff: @@ -55,7 +55,7 @@ pub unsafe fn c_str_n(s: *const c_char, n: usize) -> &'static [u8] {
  }
  pub unsafe fn cstr_from_bytes_with_nul_unchecked(bytes: &[u8]) -> *const c_char {
  - &*(bytes as *const [u8] as *const c_char)
  + bytes.as_ptr() as *const c_char
  }
  // NOTE: defined here rather than in string because memcpy() is useful in multiple crates
  