nfp: tls: fix error return code in nfp_net_tls_add()

Fix to return negative error code -EINVAL from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: 1f35a56c ("nfp: tls: add/delete TLS TX connections")
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Acked-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/crypto/tls.c

@@ -344,6 +344,7 @@ nfp_net_tls_add(struct net_device *netdev, struct sock *sk,
 
 	if (!reply->handle[0] && !reply->handle[1]) {
 		nn_dp_warn(&nn->dp, "FW returned NULL handle\n");
+		err = -EINVAL;
 		goto err_fw_remove;
 	}