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xts setkey callback returns 0 on some error paths.
Fix this by returning -EINVAL.

Cc: <stable@vger.kernel.org> # 4.12+
Fixes: b189817c

 ("crypto: caam/qi - add ablkcipher and authenc algorithms")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>