Given that the 'is_tx = 0' cannot be moved in the complete handler due to a achievable race concerning the hold off in switching to STATE_RX_AACK_ON plus a new interrupt, we introduce an intermediate 'was_tx' boolean only for this purpose. There is absolutely no Fixes tag making use of in https://eduardocfhil.ltfblog.com/28039414/the-2-minute-rule-for-wordpress-and-plugins