net: caif: spi: fix potential NULL dereference

alloc_netdev() is not checked here for NULL return value. dev is
check instead. It might lead to NULL dereference of ndev.

Signed-off-by: Vasiliy Kulikov <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/caif/caif_spi.c

···
 
 	ndev = alloc_netdev(sizeof(struct cfspi),
 			"cfspi%d", cfspi_setup);
-	if (!dev)
-		return -ENODEV;
+	if (!ndev)
+		return -ENOMEM;
 
 	cfspi = netdev_priv(ndev);
 	netif_stop_queue(ndev);