platform-bus: use get_uint() for "addr" property

This is TYPE_MEMORY_REGION's property.  Its getter
memory_region_get_addr() uses visit_type_uint64().
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170607163635.17635-27-marcandre.lureau@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>

hw/core/platform-bus.c

@@ -71,7 +71,7 @@ hwaddr platform_bus_get_mmio_addr(PlatformBusDevice *pbus, SysBusDevice *sbdev,
         return -1;
     }
 
-    return object_property_get_int(OBJECT(sbdev_mr), "addr", NULL);
+    return object_property_get_uint(OBJECT(sbdev_mr), "addr", NULL);
 }
 
 static void platform_bus_count_irqs(SysBusDevice *sbdev, void *opaque)