ath9k: Fix channel context events

Check if channel context usage is enabled before
calling ath_chanctx_event() from various parts of the
driver. Also, make sure that ath_chanctx_event() is
compiled only when CONFIG_ATH9K_CHANNEL_CONTEXT is
enabled.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 2afe790..5220f2f 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -418,8 +418,6 @@
 void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx,
 			     struct cfg80211_chan_def *chandef);
 void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx);
-void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
-		       enum ath_chanctx_event ev);
 void ath_offchannel_next(struct ath_softc *sc);
 void ath_scan_complete(struct ath_softc *sc, bool abort);
 void ath_roc_complete(struct ath_softc *sc, bool abort);
@@ -438,6 +436,8 @@
 				struct ieee80211_vif *vif);
 void ath9k_p2p_ps_timer(void *priv);
 
+void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
+		       enum ath_chanctx_event ev);
 void ath_chanctx_set_next(struct ath_softc *sc, bool force);
 #else
 static inline bool ath9k_is_chanctx_enabled(void)
@@ -453,6 +453,11 @@
 static inline void ath9k_deinit_channel_context(struct ath_softc *sc)
 {
 }
+static inline void ath_chanctx_event(struct ath_softc *sc,
+				     struct ieee80211_vif *vif,
+				     enum ath_chanctx_event ev)
+{
+}
 static inline int ath9k_init_p2p(struct ath_softc *sc)
 {
 	return 0;