This patch fixes below warning spotted by kbuild test robot when building
with ARCH=powerpc:

   drivers/clocksource/timer-stm32.c: In function 'stm32_clockevent_init':
>> drivers/clocksource/timer-stm32.c:140:9: warning: large integer implicitly 
>> truncated to unsigned type [-Woverflow]
     writel_relaxed(~0UL, data->base + TIM_ARR);

The fix consists in using 0U instead of 0UL.

Reported-by: kbuild test robot <fengguang...@intel.com>
Signed-off-by: Maxime Coquelin <mcoquelin.st...@gmail.com>
---
v2: Use 0U instead of casting to u32.
---
 drivers/clocksource/timer-stm32.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/timer-stm32.c 
b/drivers/clocksource/timer-stm32.c
index fad2e2e..a97e8b5 100644
--- a/drivers/clocksource/timer-stm32.c
+++ b/drivers/clocksource/timer-stm32.c
@@ -137,9 +137,9 @@ static void __init stm32_clockevent_init(struct device_node 
*np)
        }
 
        /* Detect whether the timer is 16 or 32 bits */
-       writel_relaxed(~0UL, data->base + TIM_ARR);
+       writel_relaxed(~0U, data->base + TIM_ARR);
        max_delta = readl_relaxed(data->base + TIM_ARR);
-       if (max_delta == ~0UL) {
+       if (max_delta == ~0U) {
                prescaler = 1;
                bits = 32;
        } else {
-- 
1.9.1

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