bridge: fix compile warning in net/bridge/br_netfilter.c

This patch fixes the following warning due to incompatible pointer
assignment:

net/bridge/br_netfilter.c: In function 'br_netfilter_rtable_init':
net/bridge/br_netfilter.c:116: warning: assignment from incompatible
pointer type

This warning is due to commit 4adf0af6
from July 30 (send correct MTU value in PMTU (revised)).
Signed-off-by: NRami Rosen <ramirose@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_netfilter.c

@@ -113,7 +113,7 @@ void br_netfilter_rtable_init(struct net_bridge *br)
 	struct rtable *rt = &br->fake_rtable;
 
 	atomic_set(&rt->u.dst.__refcnt, 1);
-	rt->u.dst.dev = &br->dev;
+	rt->u.dst.dev = br->dev;
 	rt->u.dst.path = &rt->u.dst;
 	rt->u.dst.metrics[RTAX_MTU - 1] = 1500;
 	rt->u.dst.flags	= DST_NOXFRM;