wan: remove some pointless conditionals before kfree_skb()

Remove some pointless conditionals before kfree_skb().
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: Jan "Yenya" Kasprzak <kas@fi.muni.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/cosa.c

@@ -731,7 +731,6 @@ static char *cosa_net_setup_rx(struct channel_data *chan, int size)
 	 * We can safely fall back to non-dma-able memory, because we have
 	 * the cosa->bouncebuf pre-allocated.
 	 */
-	if (chan->rx_skb)
 	kfree_skb(chan->rx_skb);
 	chan->rx_skb = dev_alloc_skb(size);
 	if (chan->rx_skb == NULL) {