Bug#615152: grub2: Cannot recognize FS format any more under kfreebsd ports

[Vladimir 'φ-coder/phcoder' Serbinenko]

> without being able to perform any task other than getting "error:
> unknown filesystem."
>
>   
The problem comes from DIOCGDINFO which apparently is broken on FreeBSD
(and this is just one way it misbehaves). So I rewrote it with geom.
Patch attached. Was tested on IRC and it fixed the problem. Needs to be
tested on GPT.

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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