crypto: sa2ul - Return crypto_aead_setkey to transfer the error

[ Upstream commit ce852f13 ]

Return crypto_aead_setkey() in order to transfer the error if
it fails.

Fixes: d2c8ac18 ("crypto: sa2ul - Add AEAD algorithm support")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>