kaweth: fix firmware download

BugLink: http://bugs.launchpad.net/bugs/1710646

commit 60bcabd0 upstream.

This fixes the oops discovered by the Umap2 project and Alan Stern.
The intf member needs to be set before the firmware is downloaded.
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

drivers/net/usb/kaweth.c

@@ -1029,6 +1029,7 @@ static int kaweth_probe(
 	kaweth = netdev_priv(netdev);
 	kaweth->dev = udev;
 	kaweth->net = netdev;
+	kaweth->intf = intf;
 
 	spin_lock_init(&kaweth->device_lock);
 	init_waitqueue_head(&kaweth->term_wait);
@@ -1139,8 +1140,6 @@ static int kaweth_probe(
 
 	dev_dbg(dev, "Initializing net device.\n");
 
-	kaweth->intf = intf;
-
 	kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!kaweth->tx_urb)
 		goto err_free_netdev;