hw/timer: QOM'ify slavio_timer

rename slavio_timer_init1 to slavio_timer_init and assign
it to slavio_timer_info.instance_init, then we drop the
SysBusDeviceClass::init
Signed-off-by: Nxiaoqiang zhao <zxq_yx_007@163.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

hw/timer/slavio_timer.c

@@ -373,9 +373,10 @@ static void slavio_timer_reset(DeviceState *d)
     s->cputimer_mode = 0;
 }
 
-static int slavio_timer_init1(SysBusDevice *dev)
+static void slavio_timer_init(Object *obj)
 {
-    SLAVIO_TIMERState *s = SLAVIO_TIMER(dev);
+    SLAVIO_TIMERState *s = SLAVIO_TIMER(obj);
+    SysBusDevice *dev = SYS_BUS_DEVICE(obj);
     QEMUBH *bh;
     unsigned int i;
     TimerContext *tc;
@@ -394,14 +395,12 @@ static int slavio_timer_init1(SysBusDevice *dev)
 
         size = i == 0 ? SYS_TIMER_SIZE : CPU_TIMER_SIZE;
         snprintf(timer_name, sizeof(timer_name), "timer-%i", i);
-        memory_region_init_io(&tc->iomem, OBJECT(s), &slavio_timer_mem_ops, tc,
+        memory_region_init_io(&tc->iomem, obj, &slavio_timer_mem_ops, tc,
                               timer_name, size);
         sysbus_init_mmio(dev, &tc->iomem);
 
         sysbus_init_irq(dev, &s->cputimer[i].irq);
     }
-
-    return 0;
 }
 
 static Property slavio_timer_properties[] = {
@@ -412,9 +411,7 @@ static Property slavio_timer_properties[] = {
 static void slavio_timer_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
-    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 
-    k->init = slavio_timer_init1;
     dc->reset = slavio_timer_reset;
     dc->vmsd = &vmstate_slavio_timer;
     dc->props = slavio_timer_properties;
@@ -424,6 +421,7 @@ static const TypeInfo slavio_timer_info = {
     .name          = TYPE_SLAVIO_TIMER,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(SLAVIO_TIMERState),
+    .instance_init = slavio_timer_init,
     .class_init    = slavio_timer_class_init,
 };