q35: fix get_mmcfg_size to use uint64 visitor

e->size is hwaddr, i.e. uint64_t. We silently truncate.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Suggested-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20170607163635.17635-14-marcandre.lureau@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

hw/pci-host/q35.c

@@ -129,9 +129,8 @@ static void q35_host_get_mmcfg_size(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
-    uint32_t value = e->size;
 
-    visit_type_uint32(v, name, &value, errp);
+    visit_type_uint64(v, name, &e->size, errp);
 }
 
 static Property mch_props[] = {