atm: unset IFF_XMIT_DST_RELEASE in clip_setup()

clip_start_xmit() needs skb->dst so tell dev_hard_start_xmit()
to no release it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/atm/clip.c b/net/atm/clip.c
index 5597b87..fb7623c 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -557,6 +557,7 @@
 	/* without any more elaborate queuing. 100 is a reasonable */
 	/* compromise between decent burst-tolerance and protection */
 	/* against memory hogs. */
+	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 }
 
 static int clip_create(int number)