serial: Kill off NO_IRQ

We transform the offenders into a test of irq <= 0 which will be ok while
the ARM people get their platform sorted. Once that is done (or in a while
if they don't do it anyway) then we will change them all to !irq checks.

For arch specific drivers that are already using NO_IRQ = 0 we just test
against zero so we don't need to re-review them later.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index 1093a88..e9a770d 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -507,7 +507,7 @@
 
 	psc_fifoc_irq = irq_of_parse_and_map(np, 0);
 	of_node_put(np);
-	if (psc_fifoc_irq == NO_IRQ) {
+	if (psc_fifoc_irq == 0) {
 		pr_err("%s: Can't get FIFOC irq\n", __func__);
 		iounmap(psc_fifoc);
 		return -ENODEV;
@@ -1354,7 +1354,7 @@
 	}
 
 	psc_ops->get_irq(port, op->dev.of_node);
-	if (port->irq == NO_IRQ) {
+	if (port->irq == 0) {
 		dev_dbg(&op->dev, "Could not get irq\n");
 		return -EINVAL;
 	}