[PATCH] mv643xx_eth: fix of_irq_to_resource() error check

[Sergei Shtylyov]

of_irq_to_resource() has recently been  fixed to return negative error #'s
along with 0 in case of failure,  however the Marvell MV643xx Ethernet
driver still only regards 0  as invalid IRQ -- fix it up.

Fixes: 7a4228bbff76 ("of: irq: use of_irq_get() in of_irq_to_resource()")
Signed-off-by: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>

---
The patch is against DaveM's 'net.git' repo.

drivers/net/ethernet/marvell/mv643xx_eth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: net/drivers/net/ethernet/marvell/mv643xx_eth.c
===================================================================
--- net.orig/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ net/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -2734,7 +2734,7 @@ static int mv643xx_eth_shared_of_add_por
        ppd.shared = pdev;
 
        memset(&res, 0, sizeof(res));
-       if (!of_irq_to_resource(pnp, 0, &res)) {
+       if (of_irq_to_resource(pnp, 0, &res) <= 0) {
                dev_err(&pdev->dev, "missing interrupt on %s\n", pnp->name);
                return -EINVAL;
        }