idpf: set the payload size before calling the async handler

idpf: set the payload size before calling the async handler

Set the payload size before forwarding the reply to the async handler.
Without this, xn->reply_sz will be 0 and idpf_mac_filter_async_handler()
will never get past the size check.

Fixes: 34c21fa894a1 ("idpf: implement virtchnl transaction manager")
Cc: stable@vger.kernel.org
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Li Li <boolli@google.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>