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/ag101p_timer.c b/drivers/timer/ag101p_timer.c
index c011906..23ad5b2 100644
--- a/drivers/timer/ag101p_timer.c
+++ b/drivers/timer/ag101p_timer.c
@@ -62,14 +62,13 @@
 	struct atftmr_timer_regs *regs;
 };
 
-static int atftmr_timer_get_count(struct udevice *dev, u64 *count)
+static u64 atftmr_timer_get_count(struct udevice *dev)
 {
 	struct atftmr_timer_platdata *plat = dev->platdata;
 	struct atftmr_timer_regs *const regs = plat->regs;
 	u32 val;
 	val = readl(&regs->t3_counter);
-	*count = timer_conv_64(val);
-	return 0;
+	return timer_conv_64(val);
 }
 
 static int atftmr_timer_probe(struct udevice *dev)