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/mtk_timer.c b/drivers/timer/mtk_timer.c
index 69ed521..74e9ea3 100644
--- a/drivers/timer/mtk_timer.c
+++ b/drivers/timer/mtk_timer.c
@@ -27,14 +27,12 @@
 	void __iomem *base;
 };
 
-static int mtk_timer_get_count(struct udevice *dev, u64 *count)
+static u64 mtk_timer_get_count(struct udevice *dev)
 {
 	struct mtk_timer_priv *priv = dev_get_priv(dev);
 	u32 val = readl(priv->base + MTK_GPT4_CNT);
 
-	*count = timer_conv_64(val);
-
-	return 0;
+	return timer_conv_64(val);
 }
 
 static int mtk_timer_probe(struct udevice *dev)