bug#9139: 24.0.50; Inappropriate warning: "File no longer exists!"

[Lars Magne Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> (visited-file-modtime)
>> => (-1 65535)
>> 
>> in foo.txt.  But is that a bug?
>
> No.  -1 as the modtime exactly means that the file does not exist.  So
> at most we need to update the doc string, assuming that we want to
> reveal such implementation details.

I've now updated the doc string.  It seems like a non-optimal return
value for this situation (nil might make more sense), though, but
changing that might break stuff, I guess.

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