e1000: Fix PCI enable to honor the need_ioport flag

On machine were no IO ports are assigned the call
to pci_enable_device() will fail, even if need_ioport
is false, we need to use pci_enable_device_mem() here.
Signed-off-by: NKarsten Keil <kkeil@suse.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/e1000/e1000_main.c

@@ -940,7 +940,7 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
 		err = pci_enable_device(pdev);
 	} else {
 		bars = pci_select_bars(pdev, IORESOURCE_MEM);
-		err = pci_enable_device(pdev);
+		err = pci_enable_device_mem(pdev);
 	}
 	if (err)
 		return err;