[MIPS] Au1000: Fix warning about unused variable.

arch/mips/au1000/common/time.c: In function `mips_timer_interrupt':
arch/mips/au1000/common/time.c:82: warning: unused variable `count'

Signed-off-by: Yoichi Yuasa <[e-mail]>
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/au1000/common/time.c

···
 void mips_timer_interrupt(void)
 {
 	int irq = 63;
-	unsigned long count;
 
 	irq_enter();
 	kstat_this_cpu.irqs[irq]++;