crypto: caam - use traditional error check pattern

Use traditional error check pattern
	ret = ...;
	if (ret)
		return ret;
	...
instead of checking error code to be 0.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/ctrl.c

@@ -333,11 +333,10 @@ static int instantiate_rng(struct device *ctrldev, int state_handle_mask,
 
 	kfree(desc);
 
-	if (!ret)
-		ret = devm_add_action_or_reset(ctrldev, devm_deinstantiate_rng,
-					       ctrldev);
-
+	if (ret)
 		return ret;
+
+	return devm_add_action_or_reset(ctrldev, devm_deinstantiate_rng, ctrldev);
 }
 
 /*