staging: rtlwifi: Remove unused variable

This removes an unused variable to silence the associated build warning.

Fixes: f8af6a32 ("staging: rtlwifi: Convert timers to use timer_setup()")
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtlwifi/base.c

@@ -2164,7 +2164,6 @@ void rtl_watchdog_wq_callback(void *data)
 void rtl_watch_dog_timer_callback(struct timer_list *t)
 {
 	struct rtl_priv *rtlpriv = from_timer(rtlpriv, t, works.watchdog_timer);
-	struct ieee80211_hw *hw = rtlpriv->hw;
 
 	queue_delayed_work(rtlpriv->works.rtl_wq,
 			   &rtlpriv->works.watchdog_wq, 0);