Fix errors

Signed-off-by: JCW <a1q123456@users.noreply.github.com>

src/xrpld/core/Coro.ipp

@@ -87,6 +87,8 @@ JobQueue::Coro::yield()
         jq_.cv_.notify_all();
     }
     (*yield_)();
+
+    return true;
 }
 
 inline bool