Fix few warnings in libgcrypt/cipher

[Werner Koch]

On Thu, 15 Dec 2011 20:36, phcoder at gmail.com said:

> Or that most of software is undertested on non-x86 and serpent isn't
> among the most used ones.

That reminds me to add a regression test for unaligned keys etc.  Before
I do a major release I try to build and check it in non-x86.


Salam-Shalom,

   Werner

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