net: ena: Remove unnecessary pci_set_drvdata()

BugLink: http://bugs.launchpad.net/bugs/1664312

The driver core clears the driver data to NULL after device_release
or on probe failure. Thus, it is not needed to manually clear the
device driver data to NULL.
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 557bc7d4)
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

drivers/net/ethernet/amazon/ena/ena_netdev.c

@@ -3060,7 +3060,6 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 err_free_region:
 	ena_release_bars(ena_dev, pdev);
 err_free_ena_dev:
-	pci_set_drvdata(pdev, NULL);
 	vfree(ena_dev);
 err_disable_device:
 	pci_disable_device(pdev);
@@ -3156,8 +3155,6 @@ static void ena_remove(struct pci_dev *pdev)
 
 	ena_release_bars(ena_dev, pdev);
 
-	pci_set_drvdata(pdev, NULL);
-
 	pci_disable_device(pdev);
 
 	ena_com_destroy_interrupt_moderation(ena_dev);