net: thunder: Check for driver data in nicvf_remove()

In some cases the crash is caused by nicvf_remove() being called from
outside. For example, if we try to feed the device to vfio after the
probe has failed for some reason. So, move the check to better place.
Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/thunder/nicvf_main.c

@@ -1583,8 +1583,14 @@ static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 static void nicvf_remove(struct pci_dev *pdev)
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
-	struct nicvf *nic = netdev_priv(netdev);
-	struct net_device *pnetdev = nic->pnicvf->netdev;
+	struct nicvf *nic;
+	struct net_device *pnetdev;
+
+	if (!netdev)
+		return;
+
+	nic = netdev_priv(netdev);
+	pnetdev = nic->pnicvf->netdev;
 
 	/* Check if this Qset is assigned to different VF.
 	 * If yes, clean primary and all secondary Qsets.
@@ -1600,9 +1606,6 @@ static void nicvf_remove(struct pci_dev *pdev)
 
 static void nicvf_shutdown(struct pci_dev *pdev)
 {
-	if (!pci_get_drvdata(pdev))
-		return;
-
 	nicvf_remove(pdev);
 }