Don't call memcpy if len is zero.
Prevent undefined behavior in CRYPTO_cbc128_encrypt: calling this function with the 'len' parameter being 0 would result in a memcpy where the source and destination parameters are the same, which is undefined behavior. Do same for AES_ige_encrypt. Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2671)
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d913a055
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