ath9k: Clear offchannel duration properly

Clearing the offchannel duration value in the
scheduler unconditionally breaks NoA when
multiple contexts are active and an offchannel
request is deferred, for example, in a scan run.

Fix this by clearing the duration only if there
is no pending offchannel request.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/channel.c

@@ -1065,7 +1065,10 @@ void ath_chanctx_set_next(struct ath_softc *sc, bool force)
 	sc->cur_chan = sc->next_chan;
 	sc->cur_chan->stopped = false;
 	sc->next_chan = NULL;
-	sc->sched.offchannel_duration = 0;
+
+	if (!sc->sched.offchannel_pending)
+		sc->sched.offchannel_duration = 0;
+
 	if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE)
 		sc->sched.state = ATH_CHANCTX_STATE_IDLE;