Fix two clang issues

Author: alan-george-lk

include/livekit/data_track_stream.h

@@ -124,7 +124,7 @@ class DataTrackStream {
   FfiHandle subscription_handle_;
 
   /** FfiClient listener id for routing FfiEvent callbacks to this object. */
-  std::int64_t listener_id_{0};
+  std::int32_t listener_id_{0};
 };
 
 } // namespace livekit

src/ffi_client.cpp

@@ -651,10 +651,8 @@ FfiClient::publishDataTrackAsync(std::uint64_t local_participant_handle,
                   "PublishDataTrackCallback missing track"}));
           return;
         }
-        proto::OwnedLocalDataTrack track = cb.track();
         pr.set_value(
-            Result<proto::OwnedLocalDataTrack, PublishDataTrackError>::success(
-                std::move(track)));
+            Result<proto::OwnedLocalDataTrack, PublishDataTrackError>::success(cb.track()));
       });
 
   proto::FfiRequest req;