rt2x00: Remove unused interface spinlock

Since the last user of intf->lock is gone we can safely remove it.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00.h

@@ -357,12 +357,6 @@ enum rt2x00_delayed_flags {
  * is allocated as the private data for ieee80211_vif.
  */
 struct rt2x00_intf {
-	/*
-	 * All fields within the rt2x00_intf structure
-	 * must be protected with a spinlock.
-	 */
-	spinlock_t lock;
-
 	/*
 	 * beacon->skb must be protected with the mutex.
 	 */

drivers/net/wireless/rt2x00/rt2x00mac.c

@@ -268,7 +268,6 @@ int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 	else
 		rt2x00dev->intf_sta_count++;
 
-	spin_lock_init(&intf->lock);
 	spin_lock_init(&intf->seqlock);
 	mutex_init(&intf->beacon_skb_mutex);
 	intf->beacon = entry;