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Allow simple ciphers to be cloned, if they don't have a cra_init function. This basically rules out those ciphers that require a fallback. In future simple ciphers will be eliminated, and replaced with a linear skcipher interface. When that happens this restriction will disappear. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>