Fixed a few memory leaks

[Szakats Istvan]

Hello

I'm using version 1.4.0 of the gcrypt library. I don't know if this bug 
has already been fixed in CVS, but I found three memory leaks in the ac 
code. The attached patch fixes these issues. I don't know if it's the 
proper way to fix it, but it works, I have no more leaks and I haven't 
seen any new issues caused by the changes so far.

Regards
Steven
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