hrtimer: Remove unused variable

Sigh, should have noticed myself.

Reported-by: fengguang.wu@intel.com
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

kernel/hrtimer.c

@@ -782,8 +782,6 @@ void clock_was_set(void)
  */
 void hrtimers_resume(void)
 {
-	struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
-
 	WARN_ONCE(!irqs_disabled(),
 		  KERN_INFO "hrtimers_resume() called with IRQs enabled!");