net: manual clean code which call skb_put_[data:zero]

Signed-off-by: yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ppp/ppp_synctty.c b/drivers/net/ppp/ppp_synctty.c
index ef08590..7868c29 100644
--- a/drivers/net/ppp/ppp_synctty.c
+++ b/drivers/net/ppp/ppp_synctty.c
@@ -697,7 +697,7 @@ ppp_sync_input(struct syncppp *ap, const unsigned char *buf,
 		goto err;
 	}
 
-	p = skb_put_data(skb, buf, count);
+	skb_put_data(skb, buf, count);
 
 	/* strip address/control field if present */
 	p = skb->data;