rgw/notifications: fetch object state to get size, in rgw_lc.cc

Failure to call get_obj_state() leaves object size and other members
uninitialized, and appears to result in in lc delete notifications
with 0 for object size.

Fixes: https://tracker.ceph.com/issues/58287

Signed-off-by: Matt Benjamin <mbenjamin@redhat.com>

src/rgw/rgw_lc.cc

@@ -552,6 +552,13 @@ static int remove_expired_obj(
   }
 
   obj = bucket->get_object(obj_key);
+
+  RGWObjState* obj_state{nullptr};
+  ret = obj->get_obj_state(dpp, &obj_state, null_yield, true);
+  if (ret < 0) {
+    return ret;
+  }
+
   std::unique_ptr<rgw::sal::Object::DeleteOp> del_op
     = obj->get_delete_op();
   del_op->params.versioning_status
@@ -582,7 +589,7 @@ static int remove_expired_obj(
       "ERROR: publishing notification failed, with error: " << ret << dendl;
   } else {
     // send request to notification manager
-    (void) notify->publish_commit(dpp, obj->get_obj_size(),
+    (void) notify->publish_commit(dpp, obj_state->size,
 				  ceph::real_clock::now(),
 				  obj->get_attrs()[RGW_ATTR_ETAG].to_str(),
 				  version_id);