ath9k: Don't reset TSF after scanning automatically

Reset automatically the TSF on re-enabling beaconing after scanning
in IBSS mode causes several problems. For example a new created IBSS
network can't age before an other node has joined, because scans are
done automatically in that case. And several other strange bugs more...

The TSF reset is done manually in the higher level mac80211 code in
the cases were it's needed, so we don't need to do it here.
Signed-off-by: Alina Friedrichsen <x-alina@gmx.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/beacon.c

@@ -790,8 +790,6 @@ void ath_beacon_config(struct ath_softc *sc, int if_id)
 		u64 tsf;
 		u32 tsftu;
 		ath9k_hw_set_interrupts(ah, 0);
-		if (nexttbtt == intval)
-			intval |= ATH9K_BEACON_RESET_TSF;
 		if (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) {
 			/*
 			 * Pull nexttbtt forward to reflect the current
@@ -825,6 +823,9 @@ void ath_beacon_config(struct ath_softc *sc, int if_id)
 				sc->imask |= ATH9K_INT_SWBA;
 			ath_beaconq_config(sc);
 		} else if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
+			if (nexttbtt == intval)
+				intval |= ATH9K_BEACON_RESET_TSF;
+
 			/*
 			 * In AP mode we enable the beacon timers and
 			 * SWBA interrupts to prepare beacon frames.