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: Karsten Keil <kkeil@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index c986978..6bd63cc 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -940,7 +940,7 @@
 		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;