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This patch fixes the following warnings: drivers/crypto/ccree/cc_aead.c:630:5-12: WARNING: Unsigned expression compared with zero: seq_len > 0 Signed-off-by: Tian Tao <tiantao6@huawei.com> v2: change hmac_setkey() return type to unsigned int to fix the warning. Acked-by: Gilad Ben-Yossef <gilad@benyossef.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>