[media] smipcie: fix sparse warnings

smipcie.c:950:31: warning: Using plain integer as NULL pointer
smipcie.c:973:31: warning: Using plain integer as NULL pointer
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/pci/smipcie/smipcie.c

@@ -947,7 +947,7 @@ static int smi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 err_pci_iounmap:
 	iounmap(dev->lmmio);
 err_kfree:
-	pci_set_drvdata(pdev, 0);
+	pci_set_drvdata(pdev, NULL);
 	kfree(dev);
 err_pci_disable_device:
 	pci_disable_device(pdev);
@@ -970,7 +970,7 @@ static void smi_remove(struct pci_dev *pdev)
 
 	smi_i2c_exit(dev);
 	iounmap(dev->lmmio);
-	pci_set_drvdata(pdev, 0);
+	pci_set_drvdata(pdev, NULL);
 	pci_disable_device(pdev);
 	kfree(dev);
 }