[PATCH for-8.2 1/4] hw/rtc/m48t59: Use 64-bit arithmetic in set_alarm()

[Peter Maydell <peter.maydell@linaro.org>]

In the m48t59 device we almost always use 64-bit arithmetic when
dealing with time_t deltas.  The one exception is in set_alarm(),
which currently uses a plain 'int' to hold the difference between two
time_t values.  Switch to int64_t instead to avoid any possible
overflow issues.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/rtc/m48t59.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/rtc/m48t59.c b/hw/rtc/m48t59.c
index ec3e56e84fd..2e2c849985c 100644
--- a/hw/rtc/m48t59.c
+++ b/hw/rtc/m48t59.c
@@ -133,7 +133,7 @@ static void alarm_cb (void *opaque)
 
 static void set_alarm(M48t59State *NVRAM)
 {
-    int diff;
+    int64_t diff;
     if (NVRAM->alrm_timer != NULL) {
         timer_del(NVRAM->alrm_timer);
         diff = qemu_timedate_diff(&NVRAM->alarm) - NVRAM->time_offset;
-- 
2.34.1