isdn: hisax: Handle return value of pnp_irq and pnp_port_start

pnp_irq() and pnp_port_start() can fail here and we must check
its return value.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/hisax/hisax_fcpcipnp.c

@@ -940,6 +940,8 @@ static int fcpnp_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id)
 	}
 	adapter->io = pnp_port_start(pdev, 0);
 	adapter->irq = pnp_irq(pdev, 0);
+	if (!adapter->io || adapter->irq == -1)
+		goto err_free;
 
 	printk(KERN_INFO "hisax_fcpcipnp: found adapter %s at IO %#x irq %d\n",
 	       (char *) dev_id->driver_data, adapter->io, adapter->irq);