napi_schedule_rps() return value is ignored, remove it.

Change the comment to clarify the intent.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Reviewed-by: NJason Xing <kerneljasonxing@gmail.com>
Tested-by: NJason Xing <kerneljasonxing@gmail.com>
Signed-off-by: NPaolo Abeni <pabeni@redhat.com>