ath9k: fixup "ath9k_htc: fix build with disabled debug"

Apparently Oleksij's compile testing was no better than mine initially
was... :-(

Cc: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/htc.h

@@ -378,7 +378,7 @@ void ath9k_htc_get_et_stats(struct ieee80211_hw *hw,
 #define TX_QSTAT_INC(c) do { } while (0)
 
 static inline void ath9k_htc_err_stat_rx(struct ath9k_htc_priv *priv,
-					 struct ath_rx_status *rs);
+					 struct ath_rx_status *rs)
 {
 }