[Toybox] Patch mountpoint

[Rob Landley]

On 05/06/2015 03:34 AM, Hyejin Kim wrote:
> Hi.
>  
> Mountpoint doesnt support symlink argument now.
> For example, "mountpoint -x symlink_path" displays wrong output.
>  
> plz have a look.

So mountpoint -d symlinktodir complains it's not a directory, but
mountpoint -x symlinktoblockdev works.

That's not just sad, it's incoherent. No wonder nobody's accepted this
into a standard.

(I'll make the suggested change, but ow.)

Rob

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