Delete unused ivar
@ -120,7 +120,7 @@ module GRPC
@send_initial_md_mutex.synchronize do
return if @metadata_sent
@metadata_to_send.merge!(new_metadata)
@metadata_tag = ActiveCall.client_invoke(@call, @metadata_to_send)
ActiveCall.client_invoke(@call, @metadata_to_send)
@metadata_sent = true
end