drivers/char: use nr_irqs

convert them to nr_irqs.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index f3cfb4c76..408f5f9 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -219,7 +219,7 @@
 	for (irq = find_first_bit(&v, HPET_MAX_IRQ); irq < HPET_MAX_IRQ;
 		irq = find_next_bit(&v, HPET_MAX_IRQ, 1 + irq)) {
 
-		if (irq >= NR_IRQS) {
+		if (irq >= nr_irqs) {
 			irq = HPET_MAX_IRQ;
 			break;
 		}