[PATCH 2/2] gianfar: irq_of_parse_and_map() error unnoticed

[Roel Kluin <roel.kluin@gmail.com>]

priv->interruptTransmit, -Receive and -Error are unsigned, so the error path
wasn't taken when irq_of_parse_and_map() returned an incorrect irq.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com> 
---
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index b2c4967..55c2ce8 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -203,9 +203,9 @@ static int gfar_of_init(struct net_device *dev)
 
 		priv->interruptError = irq_of_parse_and_map(np, 2);
 
-		if (priv->interruptTransmit < 0 ||
-				priv->interruptReceive < 0 ||
-				priv->interruptError < 0) {
+		if (priv->interruptTransmit == NO_IRQ ||
+				priv->interruptReceive == NO_IRQ ||
+				priv->interruptError == NO_IRQ) {
 			err = -EINVAL;
 			goto err_out;
 		}