x86: nmi and irq counters are unsigned in nmi_64.c

__nmi_count, apic_timer_irqs and irq0_irqs are unsigned.
Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/nmi_64.c

@@ -79,7 +79,7 @@ static __init void nmi_cpu_busy(void *data)
 
 int __init check_nmi_watchdog(void)
 {
-	int *prev_nmi_count;
+	unsigned int *prev_nmi_count;
 	int cpu;
 
 	if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
@@ -316,7 +316,7 @@ EXPORT_SYMBOL(touch_nmi_watchdog);
 notrace __kprobes int
 nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
 {
-	int sum;
+	unsigned int sum;
 	int touched = 0;
 	int cpu = smp_processor_id();
 	int rc = 0;