crypto: squash lines for simple wrapper functions

Remove unneeded variables and assignments.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/mcryptd.c b/crypto/mcryptd.c
index 86fb59b..94ee44a 100644
--- a/crypto/mcryptd.c
+++ b/crypto/mcryptd.c
@@ -612,12 +612,7 @@
 
 int ahash_mcryptd_digest(struct ahash_request *desc)
 {
-	int err;
-
-	err = crypto_ahash_init(desc) ?:
-	      ahash_mcryptd_finup(desc);
-
-	return err;
+	return crypto_ahash_init(desc) ?: ahash_mcryptd_finup(desc);
 }
 
 int ahash_mcryptd_update(struct ahash_request *desc)