SysBusDevice::mmio[] is kind of internal. Use the proper
sysbus_mmio_get_region() accessor.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/timer/hpet.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c
index 1acba4fa9db..4ed79d72620 100644
--- a/hw/timer/hpet.c
+++ b/hw/timer/hpet.c
@@ -655,6 +655,7 @@ static void hpet_reset(DeviceState *d)
 {
     HPETState *s = HPET(d);
     SysBusDevice *sbd = SYS_BUS_DEVICE(d);
+    MemoryRegion *mr = sysbus_mmio_get_region(sbd, 0);
     int i;
 
     for (i = 0; i < s->num_timers; i++) {
@@ -677,7 +678,7 @@ static void hpet_reset(DeviceState *d)
     s->hpet_offset = 0ULL;
     s->config = 0ULL;
     hpet_fw_cfg.hpet[s->hpet_id].event_timer_block_id = (uint32_t)s->capability;
-    hpet_fw_cfg.hpet[s->hpet_id].address = sbd->mmio[0].addr;
+    hpet_fw_cfg.hpet[s->hpet_id].address = mr->addr;
 
     /* to document that the RTC lowers its output on reset as well */
     s->rtc_irq_level = 0;
-- 
2.51.0