wl12xx: fix warning due to missing arg in ampdu_action

Commit 0b01f030 added a new argument
to the ampdu_action operation.  The ampdu_action operation in the
wl12xx driver currently doesn't have that argument and this generates
a warning.  This happened during merging of the latest mac80211
patches with the wl12xx BA patches.

  CC [M]  drivers/net/wireless/wl12xx/main.o
drivers/net/wireless/wl12xx/main.c:3035: warning: initialization from incompatible pointer type

The wl12xx driver doesn't need to do anything about the buf_size
argument since the AMPDU TX is fully handled by the firmware.
Signed-off-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/main.c

@@ -2725,7 +2725,8 @@ static int wl1271_op_sta_remove(struct ieee80211_hw *hw,
 
 int wl1271_op_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 			   enum ieee80211_ampdu_mlme_action action,
-			    struct ieee80211_sta *sta, u16 tid, u16 *ssn)
+			   struct ieee80211_sta *sta, u16 tid, u16 *ssn,
+			   u8 buf_size)
 {
 	struct wl1271 *wl = hw->priv;
 	int ret;