staging: rtl8192u: Remove variable set but not used

Remove variable "int ret", declared but not used.

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>

drivers/staging/rtl8192u/r8192U_core.c

@@ -902,7 +902,6 @@ static void rtl8192_hard_data_xmit(struct sk_buff *skb, struct net_device *dev,
 				   int rate)
 {
 	struct r8192_priv *priv = (struct r8192_priv *)ieee80211_priv(dev);
-	int ret;
 	unsigned long flags;
 	struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
 	u8 queue_index = tcb_desc->queue_index;