vxge: add missing flush of reset_task

Commit 6e07ebd8 (drivers/net: remove unnecessary
flush_scheduled_work() calls) incorrectly removed the flush call
without replacing it with the appropriate work specific operation.
Fix it by flushing vdev->reset_task explicitly.

Pointed out by Jon Mason.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jon Mason <jon.mason@exar.com>
Acked-by: Jon Mason <jon.mason@exar.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vxge/vxge-main.c

@@ -3439,6 +3439,8 @@ static void vxge_device_unregister(struct __vxge_hw_device *hldev)
 
 	strncpy(buf, dev->name, IFNAMSIZ);
 
+	flush_work_sync(&vdev->reset_task);
+
 	/* in 2.6 will call stop() if device is up */
 	unregister_netdev(dev);