SQUASHME: added missing files

Author: thomaseichinger

drivers/at86rf231/at86rf231_tx.c

@@ -172,8 +172,11 @@ netdev_802154_tx_status_t at86rf231_transmit_tx_buf(netdev_t *dev)
     }
 
     uint8_t trac_status;
-    while ((trac_status = at86rf231_get_trac_status())
-           == AT86RF231_TRX_STATE__TRAC_INVALID) {};
+    do {
+        trac_status = at86rf231_reg_read(AT86RF231_REG__TRX_STATE);
+        trac_status &= AT86RF231_TRX_STATE_MASK__TRAC;
+    }
+    while (trac_status == AT86RF231_TRX_STATE__TRAC_INVALID);
 
     switch (trac_status) {
         case AT86RF231_TRX_STATE__TRAC_CHANNEL_ACCESS_FAILURE: