staging: netlogic: Fix comparison to NULL

Avoid the use of comparison to NULL, use !<variable> instead. Checkpatch
detected these issues.
Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/netlogic/xlr_net.c

@@ -146,7 +146,7 @@ static void xlr_net_fmn_handler(int bkt, int src_stnid, int size, int code,
 		addr = addr - MAC_SKB_BACK_PTR_SIZE;
 		skb = (struct sk_buff *)(*(unsigned long *)addr);
 		skb->dev = adapter->netdev[port];
-		if (skb->dev == NULL)
+		if (!skb->dev)
 			return;
 		ndev = skb->dev;
 		priv = netdev_priv(ndev);
@@ -1052,7 +1052,7 @@ static int xlr_net_probe(struct platform_device *pdev)
 		adapter->netdev[port] = ndev;
 
 		res = platform_get_resource(pdev, IORESOURCE_IRQ, port);
-		if (res == NULL) {
+		if (!res) {
 			pr_err("No irq resource for MAC %d\n", priv->port_id);
 			err = -ENODEV;
 			goto err_gmac;