at86rf230: fix callback for aret handling

This patch fix the complete callback for going into aret on. Currently
we starting after a state change into aret on again a state change into
aret on which is not necessary.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 5601c74..8d5ed6e 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -1013,7 +1013,7 @@
 		if (lp->is_tx_from_off) {
 			lp->is_tx_from_off = false;
 			at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
-						     at86rf230_xmit_tx_on,
+						     at86rf230_write_frame,
 						     false);
 		} else {
 			at86rf230_async_state_change(lp, ctx, STATE_TX_ON,