bug#11156: 24.2.50; require-final-newline and read-only files

[Chong Yidong]

Christopher Schmidt <christopher@ch.ristopher.com> writes:

> There is still a minor bug in regard to require-final-newline.
>
> Recipe:
> emacs -q
> M-: (setq require-final-newline 'visit)
> Open an image file via C-x C-f
>
> There is a new buffer but no window displays it.  The *Messages*-buffer
> contains "find-file-noselect-1: Text is read-only".
>
> I think all code fragments that try to add new lines due to
> require-final-newline should ignore text-read-only errors.

Fixed, thanks.