hw/xen: Constify XenLegacyDevice::XenDevOps

XenDevOps @ops is not updated, mark it const.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Paul Durrant <paul@xen.org>
Message-Id: <20240510104908.76908-3-philmd@linaro.org>

hw/xen/xen-legacy-backend.c

@@ -170,7 +170,7 @@ int xen_be_copy_grant_refs(struct XenLegacyDevice *xendev,
  */
 static struct XenLegacyDevice *xen_be_get_xendev(const char *type, int dom,
                                                  int dev,
-                                                 struct XenDevOps *ops)
+                                                 const struct XenDevOps *ops)
 {
     struct XenLegacyDevice *xendev;
 

include/hw/xen/xen_pvdev.h

@@ -52,7 +52,7 @@ struct XenLegacyDevice {
     xenevtchn_handle   *evtchndev;
     xengnttab_handle   *gnttabdev;
 
-    struct XenDevOps   *ops;
+    const struct XenDevOps *ops;
     QTAILQ_ENTRY(XenLegacyDevice) next;
 };