cirrus: cs89x0: remove set but not used variable 'lp'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/ethernet/cirrus/cs89x0.c: In function 'cs89x0_platform_probe':
drivers/net/ethernet/cirrus/cs89x0.c:1847:20: warning:
 variable 'lp' set but not used [-Wunused-but-set-variable]
Reported-by: NHulk Robot <hulkci@huawei.com>
Fixes: 6751edeb ("cirrus: cs89x0: Use managed interfaces")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/cirrus/cs89x0.c

@@ -1844,15 +1844,12 @@ cleanup_module(void)
 static int __init cs89x0_platform_probe(struct platform_device *pdev)
 {
 	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
-	struct net_local *lp;
 	void __iomem *virt_addr;
 	int err;
 
 	if (!dev)
 		return -ENOMEM;
 
-	lp = netdev_priv(dev);
-
 	dev->irq = platform_get_irq(pdev, 0);
 	if (dev->irq <= 0) {
 		dev_warn(&dev->dev, "interrupt resource missing\n");