clocksource/drivers/time-armada-370-xp: Fix return value check

The failure check of armada_370_xp_timer_setup() in
armada_370_xp_timer_common_init() is negated. This leads to an error message
and exit in case of a successful initialization.  Remove the stray '!'.

Fixes: 12549e27 ("clocksource/drivers/time-armada-370-xp: Convert init function to return error")
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1607121731020.1344@hypnos.tec.linutronix.deSigned-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/clocksource/time-armada-370-xp.c

@@ -342,7 +342,7 @@ static int __init armada_370_xp_timer_common_init(struct device_node *np)
 	}
 
 	res = armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
-	if (!res) {
+	if (res) {
 		pr_err("Failed to setup timer");
 		return res;
 	}