[IA64] Don't go beyond iosapic_intr_info's arraysize

vi arch/ia64/kernel/iosapic.c +142
static struct iosapic_intr_info {
	...
} iosapic_intr_info[NR_IRQS];

But at line 510 we have:
	for (i = 0; i <= NR_IRQS; i++) {

s/<=/</
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/iosapic.c

@@ -507,7 +507,7 @@ static int iosapic_find_sharable_irq(unsigned long trigger, unsigned long pol)
 	if (trigger == IOSAPIC_EDGE)
 		return -EINVAL;
 
-	for (i = 0; i <= NR_IRQS; i++) {
+	for (i = 0; i < NR_IRQS; i++) {
 		info = &iosapic_intr_info[i];
 		if (info->trigger == trigger && info->polarity == pol &&
 		    (info->dmode == IOSAPIC_FIXED ||