agent: Fix agent_public_key_from_file for ECC

[Werner Koch]

On Mon, 26 Jan 2015 03:25, gniibe at fsij.org said:

> So, here is the patch of the first part.
>
> OK to commit?

I have not checked it but I think it is okay to commit.  I will run some
tests on it this week.


Shalom-Salam,

   Werner

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