isdn: hisax: Fix pnp_irq's error checking for setup_teles3

The pnp_irq() function returns -1 if an error occurs.
pnp_irq() error checking for zero is not correct.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/isdn/hisax/teles3.c

@@ -306,7 +306,7 @@ int setup_teles3(struct IsdnCard *card)
 					card->para[2] = pnp_port_start(pnp_d, 1);
 					card->para[1] = pnp_port_start(pnp_d, 0);
 					card->para[0] = pnp_irq(pnp_d, 0);
-					if (!card->para[0] || !card->para[1] || !card->para[2]) {
+					if (card->para[0] == -1 || !card->para[1] || !card->para[2]) {
 						printk(KERN_ERR "Teles PnP:some resources are missing %ld/%lx/%lx\n",
 						       card->para[0], card->para[1], card->para[2]);
 						pnp_disable_dev(pnp_d);