ptp: ocp: Fix a resource leak in an error handling path

If an error occurs after a successful 'pci_ioremap_bar()' call, it must be
undone by a corresponding 'pci_iounmap()' call, as already done in the
remove function.

Fixes: a7e1abad ("ptp: Add clock driver for the OpenCompute TimeCard.")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/ptp/ptp_ocp.c

@@ -324,7 +324,7 @@ ptp_ocp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (!bp->base) {
 		dev_err(&pdev->dev, "io_remap bar0\n");
 		err = -ENOMEM;
-		goto out;
+		goto out_release_regions;
 	}
 	bp->reg = bp->base + OCP_REGISTER_OFFSET;
 	bp->tod = bp->base + TOD_REGISTER_OFFSET;
@@ -347,6 +347,8 @@ ptp_ocp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	return 0;
 
 out:
+	pci_iounmap(pdev, bp->base);
+out_release_regions:
 	pci_release_regions(pdev);
 out_disable:
 	pci_disable_device(pdev);