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Now that the ghash and gcm drivers are split, we no longer need to allocate
a key struct for the former that carries powers of H that are only used by
the latter. Also, take this opportunity to clean up the code a little bit.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>