crypto-add-lz4-cryptographic-api-fix

crypto-add-lz4-cryptographic-api-fix

fix warnings

Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: "Darrick J. Wong" <djwong@us.ibm.com>
Cc: Bob Pearson <rpearson@systemfabricworks.com>
Cc: Chanho Min <chanho.min@lge.com>
Cc: Herbert Xu <herbert@gondor.hengli.com.au>
Cc: Kyungsik Lee <kyungsik.lee@lge.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Yann Collet <yann.collet.73@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>