rtlwifi: Remove duplicated prototype

Remove duplicated prototype in base.h
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/rtlwifi/base.h

@@ -123,7 +123,6 @@ bool rtl_tx_mgmt_proc(struct ieee80211_hw *hw, struct sk_buff *skb);
 u8 rtl_is_special_data(struct ieee80211_hw *hw, struct sk_buff *skb, u8 is_tx);
 
 void rtl_beacon_statistic(struct ieee80211_hw *hw, struct sk_buff *skb);
-void rtl_watch_dog_timer_callback(unsigned long data);
 int rtl_tx_agg_start(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	struct ieee80211_sta *sta, u16 tid, u16 *ssn);
 int rtl_tx_agg_stop(struct ieee80211_hw *hw, struct ieee80211_vif *vif,