crypto: algif_skcipher - Add nokey compatibility path

    commit a0fa2d03 upstream.

    This patch adds a compatibility path to support old applications
    that do acept(2) before setkey.

    Cc: stable@vger.kernel.org
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
    [backported to 3.18 by Milan Broz <gmazyland@gmail.com>]

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>