ath5k: write PCU registers on initial reset

commit 3355443a upstream.

"Ath5k: unify resets"
introduced a regression into 2.6.28 where the PCU registers are never
initialized, due to ath5k_reset() always passing true for change_channel.
We subsequently program a lot of these registers but several may start
in an unknown state.
Reported-by: Forrest Zhang <forrest@hifulltech.com>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/net/wireless/ath/ath5k/base.c

@@ -2676,7 +2676,7 @@ ath5k_reset(struct ath5k_softc *sc, struct ieee80211_channel *chan)
 		sc->curchan = chan;
 		sc->curband = &sc->sbands[chan->band];
 	}
-	ret = ath5k_hw_reset(ah, sc->opmode, sc->curchan, true);
+	ret = ath5k_hw_reset(ah, sc->opmode, sc->curchan, chan != NULL);
 	if (ret) {
 		ATH5K_ERR(sc, "can't reset hardware (%d)\n", ret);
 		goto err;