arm: footbridge: Make cksrc_dc21285_disable() void

This clocksource function needs to be void.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/arm/mach-footbridge/dc21285-timer.c

@@ -30,7 +30,7 @@ static int cksrc_dc21285_enable(struct clocksource *cs)
 	return 0;
 }
 
-static int cksrc_dc21285_disable(struct clocksource *cs)
+static void cksrc_dc21285_disable(struct clocksource *cs)
 {
 	*CSR_TIMER2_CNTL = 0;
 }