bug#42431: 28.0.50; browse-url-of-dired-file confusing messaging

[Eli Zaretskii]

> Date: Thu, 13 Oct 2022 01:51:00 -0700
> Cc: michael.albinus@gmx.de, 42431@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> 
> --- a/src/fileio.c
> +++ b/src/fileio.c
> @@ -5000,7 +5000,7 @@ because (1) it preserves some marker positions (in 
> unchanged portions
>        unbind_to (count1, Qnil);
>      }
>  
> -  if (NILP (handler) && !NILP (visit) && current_buffer->modtime.tv_nsec < 0)
> +  if (save_errno != 0)
>      {
>        /* Signal an error if visiting a file that could not be opened.  */
>        report_file_errno ("Opening input file", orig_filename, save_errno);

Why would we want to signal an error when VISIT is nil?  We didn't
before.