dir_create_for_fn(): Don't create a directory if [fn] contains no slash.
dir_create_for_fn(): Don't create a directory if [fn] contains no slash.

Duh! Wasn't that exactly why we needed that function in the first place? file_write(), the only caller of this function, wouldn't expect it any other way.  Quite interesting that I've never noticed this because we've always written to files in subdirectories. Well, not anymore.

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