ath9k: move ath_tx_aggr_check() to the rate control module

It is not used anywhere else and can be made static

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -1320,6 +1320,22 @@ static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
 	return caps;
 }
 
+static bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an,
+			      u8 tidno)
+{
+	struct ath_atx_tid *txtid;
+
+	if (!(sc->sc_flags & SC_OP_TXAGGR))
+		return false;
+
+	txtid = ATH_AN_2_TID(an, tidno);
+
+	if (!(txtid->state & (AGGR_ADDBA_COMPLETE | AGGR_ADDBA_PROGRESS)))
+			return true;
+	return false;
+}
+
+
 /***********************************/
 /* mac80211 Rate Control callbacks */
 /***********************************/