rt2x00: Rename queue->lock to queue->index_lock

The queue->lock is only used to protect the index
numbers. Rename the lock accordingly.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.h b/drivers/net/wireless/rt2x00/rt2x00queue.h
index 64c00e2..29b051a 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.h
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
@@ -398,7 +398,7 @@
  * @entries: Base address of the &struct queue_entry which are
  *	part of this queue.
  * @qid: The queue identification, see &enum data_queue_qid.
- * @lock: Spinlock to protect index handling. Whenever @index, @index_done or
+ * @index_lock: Spinlock to protect index handling. Whenever @index, @index_done or
  *	@index_crypt needs to be changed this lock should be grabbed to prevent
  *	index corruption due to concurrency.
  * @count: Number of frames handled in the queue.
@@ -422,7 +422,7 @@
 
 	enum data_queue_qid qid;
 
-	spinlock_t lock;
+	spinlock_t index_lock;
 	unsigned int count;
 	unsigned short limit;
 	unsigned short threshold;