crypto: caam - clean-up in caam_init_rng()

Clean up the code, as indicated by Coccinelle.

Cc: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index 41398da..fde07d4 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -285,11 +285,7 @@ static int caam_init_rng(struct caam_rng_ctx *ctx, struct device *jrdev)
 	if (err)
 		return err;
 
-	err = caam_init_buf(ctx, 1);
-	if (err)
-		return err;
-
-	return 0;
+	return caam_init_buf(ctx, 1);
 }
 
 static struct hwrng caam_rng = {