Fix the following checkpatch error:

ERROR: do not initialise globals to 0

Signed-off-by: Ran Sun <sunran001@208suo.com>
---
  arch/x86/kernel/apic/apic.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index af49e24b46a4..8d46733ad94b 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -202,7 +202,7 @@ static struct resource lapic_resource = {
  	.flags = IORESOURCE_MEM | IORESOURCE_BUSY,
  };

-unsigned int lapic_timer_period = 0;
+unsigned int lapic_timer_period;

  static void apic_pm_activate(void);