[MIPS] Fix the installation condition of MIPS clocksource

Signed-off-by: NYoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/time.c

@@ -157,6 +157,6 @@ void __init time_init(void)
 {
 	plat_time_init();
 
-	if (mips_clockevent_init() || !cpu_has_mfc0_count_bug())
+	if (!mips_clockevent_init() || !cpu_has_mfc0_count_bug())
 		init_mips_clocksource();
 }