iwlwifi: fix memory leak in command queue handling

Also free the array of command pointers and meta data of each
command buffer when command queue is freed.
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-tx.c

@@ -197,6 +197,12 @@ void iwl_cmd_queue_free(struct iwl_priv *priv)
 		pci_free_consistent(dev, priv->hw_params.tfd_size *
 				    txq->q.n_bd, txq->tfds, txq->q.dma_addr);
 
+	/* deallocate arrays */
+	kfree(txq->cmd);
+	kfree(txq->meta);
+	txq->cmd = NULL;
+	txq->meta = NULL;
+
 	/* 0-fill queue descriptor structure */
 	memset(txq, 0, sizeof(*txq));
 }