Don't require that the special/filesystem argument translates into

a block or character device; the rest of tunefs works just fine on
filesystem images in regular files. Instead, if getfsfile() failed
and if the specified filesystem is a directory then print a more
useful "unknown file system" error.

Also, _PATH_DEV already contains a trailing slash, so don't add
another one when constructing a device path, and use errx() instead
of err() in a case where errno is meangingless.

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