octeontx2-pf: mcs: fix missing unlock in some error paths

Add the missing unlock in some error paths.

Fixes: c54ffc7360 ("octeontx2-pf: mcs: Introduce MACSEC hardware offloading")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/nic/cn10k_macsec.c

@@ -284,7 +284,7 @@ static int cn10k_mcs_write_sc_cam(struct otx2_nic *pfvf,
 
 	sc_req = otx2_mbox_alloc_msg_mcs_rx_sc_cam_write(mbox);
 	if (!sc_req) {
-		return -ENOMEM;
+		ret = -ENOMEM;
 		goto fail;
 	}
 
@@ -594,7 +594,7 @@ static int cn10k_mcs_ena_dis_flowid(struct otx2_nic *pfvf, u16 hw_flow_id,
 
 	req = otx2_mbox_alloc_msg_mcs_flowid_ena_entry(mbox);
 	if (!req) {
-		return -ENOMEM;
+		ret = -ENOMEM;
 		goto fail;
 	}
 
@@ -1653,6 +1653,7 @@ int cn10k_mcs_init(struct otx2_nic *pfvf)
 	return 0;
 fail:
 	dev_err(pfvf->dev, "Cannot notify PN wrapped event\n");
+	mutex_unlock(&mbox->lock);
 	return 0;
 }