crypto: caam - free resources in case caam_rng registration failed

Check the return value of the hardware registration for caam_rng and free
resources in case of failure.

Fixes: e24f7c9 ("crypto: caam - hwrng support")
Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/caamrng.c

@@ -333,7 +333,10 @@ int caam_rng_init(struct device *ctrldev)
 		goto free_rng_ctx;
 
 	dev_info(dev, "registering rng-caam\n");
-	return hwrng_register(&caam_rng);
+
+	err = hwrng_register(&caam_rng);
+	if (!err)
+		return err;
 
 free_rng_ctx:
 	kfree(rng_ctx);