the wrong variable checked after request_irq()

Signed-off-by: Al Viro <[e-mail]>
Acked-by: Benjamin Herrenschmidt <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/powerpc/platforms/pseries/setup.c

···
 		return;
 
 	cascade_irq = irq_of_parse_and_map(cascade, 0);
-	if (cascade == NO_IRQ) {
+	if (cascade_irq == NO_IRQ) {
 		printk(KERN_ERR "mpic: failed to map cascade interrupt");
 		return;
 	}