timer: Return count from timer_ops.get_count

No timer drivers return an error from get_count. Instead of possibly
returning an error, just return the count directly.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/timer/sti-timer.c b/drivers/timer/sti-timer.c
index ff42056..e6843eb 100644
--- a/drivers/timer/sti-timer.c
+++ b/drivers/timer/sti-timer.c
@@ -17,7 +17,7 @@
 	struct globaltimer *global_timer;
 };
 
-static int sti_timer_get_count(struct udevice *dev, u64 *count)
+static u64 sti_timer_get_count(struct udevice *dev)
 {
 	struct sti_timer_priv *priv = dev_get_priv(dev);
 	struct globaltimer *global_timer = priv->global_timer;
@@ -34,9 +34,7 @@
 			old = high;
 	}
 	timer = high;
-	*count = (u64)((timer << 32) | low);
-
-	return 0;
+	return (u64)((timer << 32) | low);
 }
 
 static int sti_timer_probe(struct udevice *dev)