b43: Remove TX spinlock

Index: wireless-testing/drivers/net/wireless/b43/b43.h
===================================================================
@@ -683,6 +683,11 @@ struct b43_wl {
 	 * This is scheduled when we determine that the actual TX output
 	 * power doesn't match what we want. */
 	struct work_struct txpower_adjust_work;
+
+	/* Packet transmit work */
+	struct work_struct tx_work;
+	/* Queue of packets to be transmitted. */
+	struct sk_buff_head tx_queue;
 };
 
 /* The type of the firmware file. */

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