net: caif: check return value of alloc_netdev

I don't know if dev can actually be NULL here, but the test should be
above alloc_netdev(), to avoid leaking the struct net_device in case
dev is actually NULL. And of course the return value from alloc_netdev
should be tested.

Signed-off-by: Rasmus Villemoes <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/caif/caif_spi.c

···
 	int res;
 	dev = (struct cfspi_dev *)pdev->dev.platform_data;
 
-	ndev = alloc_netdev(sizeof(struct cfspi), "cfspi%d",
-			    NET_NAME_UNKNOWN, cfspi_setup);
 	if (!dev)
 		return -ENODEV;
+
+	ndev = alloc_netdev(sizeof(struct cfspi), "cfspi%d",
+			    NET_NAME_UNKNOWN, cfspi_setup);
+	if (!ndev)
+		return -ENOMEM;
 
 	cfspi = netdev_priv(ndev);
 	netif_stop_queue(ndev);