migration: remove error from notifier data

Remove the error object from opaque data passed to notifiers.
Use the new error parameter passed to the notifier instead.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/1708622920-68779-3-git-send-email-steven.sistare@oracle.com
Signed-off-by: Peter Xu <peterx@redhat.com>

hw/virtio/vhost-user.c

@@ -2096,20 +2096,20 @@ static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier,
         if (!virtio_has_feature(dev->protocol_features,
                                 VHOST_USER_PROTOCOL_F_PAGEFAULT)) {
             /* TODO: Get the device name into this error somehow */
-            error_setg(pnd->errp,
+            error_setg(errp,
                        "vhost-user backend not capable of postcopy");
             return -ENOENT;
         }
         break;
 
     case POSTCOPY_NOTIFY_INBOUND_ADVISE:
-        return vhost_user_postcopy_advise(dev, pnd->errp);
+        return vhost_user_postcopy_advise(dev, errp);
 
     case POSTCOPY_NOTIFY_INBOUND_LISTEN:
-        return vhost_user_postcopy_listen(dev, pnd->errp);
+        return vhost_user_postcopy_listen(dev, errp);
 
     case POSTCOPY_NOTIFY_INBOUND_END:
-        return vhost_user_postcopy_end(dev, pnd->errp);
+        return vhost_user_postcopy_end(dev, errp);
 
     default:
         /* We ignore notifications we don't know */

include/migration/misc.h

@@ -31,7 +31,6 @@ typedef enum PrecopyNotifyReason {
 
 typedef struct PrecopyNotifyData {
     enum PrecopyNotifyReason reason;
-    Error **errp;
 } PrecopyNotifyData;
 
 void precopy_infrastructure_init(void);

migration/postcopy-ram.c

@@ -77,7 +77,6 @@ int postcopy_notify(enum PostcopyNotifyReason reason, Error **errp)
 {
     struct PostcopyNotifyData pnd;
     pnd.reason = reason;
-    pnd.errp = errp;
 
     return notifier_with_return_list_notify(&postcopy_notifier_list,
                                             &pnd, errp);

migration/postcopy-ram.h

@@ -128,7 +128,6 @@ enum PostcopyNotifyReason {
 
 struct PostcopyNotifyData {
     enum PostcopyNotifyReason reason;
-    Error **errp;
 };
 
 void postcopy_add_notifier(NotifierWithReturn *nn);

migration/ram.c

@@ -426,7 +426,6 @@ int precopy_notify(PrecopyNotifyReason reason, Error **errp)
 {
     PrecopyNotifyData pnd;
     pnd.reason = reason;
-    pnd.errp = errp;
 
     return notifier_with_return_list_notify(&precopy_notifier_list, &pnd, errp);
 }