ethernet: broadcom/sb1250-mac: remove BUG_ON in sbmac_probe()

Replace the BUG_ON() with returning error code to handle
the fault more gracefully.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/sb1250-mac.c

@@ -2534,7 +2534,12 @@ static int sbmac_probe(struct platform_device *pldev)
 	int err;
 
 	res = platform_get_resource(pldev, IORESOURCE_MEM, 0);
-	BUG_ON(!res);
+	if (!res) {
+		printk(KERN_ERR "%s: failed to get resource\n",
+		       dev_name(&pldev->dev));
+		err = -EINVAL;
+		goto out_out;
+	}
 	sbm_base = ioremap(res->start, resource_size(res));
 	if (!sbm_base) {
 		printk(KERN_ERR "%s: unable to map device registers\n",