net: ethernet: ti: davinci_cpdma: free memory while channel destroy

While create/destroy channel operation memory is not freed. It was
supposed that memory is freed while driver remove. But a channel
can be created and destroyed many times while changing number of
channels with ethtool.

Based on net-next/master

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/davinci_cpdma.c

@@ -533,7 +533,7 @@ int cpdma_chan_destroy(struct cpdma_chan *chan)
 		cpdma_chan_stop(chan);
 	ctlr->channels[chan->chan_num] = NULL;
 	ctlr->chan_num--;
-
+	devm_kfree(ctlr->dev, chan);
 	cpdma_chan_split_pool(ctlr);
 
 	spin_unlock_irqrestore(&ctlr->lock, flags);