virtio-crypto: fix memory leak in virtio_crypto_alg_skcipher_close_session()

'vc_ctrl_req' is alloced in virtio_crypto_alg_skcipher_close_session(),
and should be freed in the invalid ctrl_status->status error handling
case. Otherwise there is a memory leak.

Fixes: 0756ad15 ("virtio-crypto: use private buffer for control request")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Message-Id: <20221114110740.537276-1-weiyongjun@huaweicloud.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Acked-by: zhenwei pi<pizhenwei@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>

drivers/crypto/virtio/virtio_crypto_skcipher_algs.c

@@ -239,7 +239,8 @@ static int virtio_crypto_alg_skcipher_close_session(
 		pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
 			ctrl_status->status, destroy_session->session_id);
 
-		return -EINVAL;
+		err = -EINVAL;
+		goto out;
 	}
 
 	err = 0;