mac80211: fix a few -Wshadow warnings

It seems that -Wshadow is no longer default in
sparse runs, but let's fix the warnings anyway.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index 30c265c..d67f0b9 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -350,7 +350,6 @@
 	bool send_to_cooked;
 	bool acked;
 	struct ieee80211_bar *bar;
-	u16 tid;
 	int rtap_len;
 
 	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
@@ -412,7 +411,7 @@
 		}
 
 		if (!acked && ieee80211_is_back_req(fc)) {
-			u16 control;
+			u16 tid, control;
 
 			/*
 			 * BAR failed, store the last SSN and retry sending
@@ -516,7 +515,8 @@
 
 		if (ieee80211_is_nullfunc(hdr->frame_control) ||
 		    ieee80211_is_qos_nullfunc(hdr->frame_control)) {
-			bool acked = info->flags & IEEE80211_TX_STAT_ACK;
+			acked = info->flags & IEEE80211_TX_STAT_ACK;
+
 			cfg80211_probe_status(skb->dev, hdr->addr1,
 					      cookie, acked, GFP_ATOMIC);
 		} else {