mac80211: remove a few set but unused variables

Found by compiling with W=1.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/main.c

@@ -100,7 +100,6 @@ static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
 	int power;
 	enum nl80211_channel_type channel_type;
 	u32 offchannel_flag;
-	bool scanning = false;
 
 	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 	if (local->scan_channel) {
@@ -147,9 +146,6 @@ static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
 		changed |= IEEE80211_CONF_CHANGE_SMPS;
 	}
 
-	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
-		   test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
-		   test_bit(SCAN_HW_SCANNING, &local->scanning);
 	power = chan->max_power;
 
 	rcu_read_lock();

net/mac80211/mesh.c

@@ -699,10 +699,8 @@ ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 static int
 ieee80211_mesh_rebuild_beacon(struct ieee80211_if_mesh *ifmsh)
 {
-	struct ieee80211_sub_if_data *sdata;
 	struct beacon_data *old_bcn;
 	int ret;
-	sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 
 	mutex_lock(&ifmsh->mtx);
 
@@ -833,9 +831,8 @@ ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
 	struct ieee80211_mgmt *hdr;
 	struct ieee802_11_elems elems;
 	size_t baselen;
-	u8 *pos, *end;
+	u8 *pos;
 
-	end = ((u8 *) mgmt) + len;
 	pos = mgmt->u.probe_req.variable;
 	baselen = (u8 *) pos - (u8 *) mgmt;
 	if (baselen > len)

net/mac80211/scan.c

@@ -153,7 +153,6 @@ void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
 	u8 *elements;
 	struct ieee80211_channel *channel;
 	size_t baselen;
-	bool beacon;
 	struct ieee802_11_elems elems;
 
 	if (skb->len < 24 ||
@@ -175,11 +174,9 @@ void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
 
 		elements = mgmt->u.probe_resp.variable;
 		baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
-		beacon = false;
 	} else {
 		baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
 		elements = mgmt->u.beacon.variable;
-		beacon = true;
 	}
 
 	if (baselen > skb->len)