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users may call crypto_has_acomp to confirm the existence of acomp before using crypto_acomp APIs. Right now, many acomp have scomp backend, for example, lz4, lzo, deflate etc. crypto_has_acomp will return false for them even though they support acomp APIs. Signed-off-by: Barry Song <song.bao.hua@hisilicon.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>