lwtunnel: change prototype of lwtunnel_state_get()

It saves some lines and simplify a bit the code when the state is returning
by this function. It's also useful to handle a NULL entry.

To avoid too long lines, I've also renamed lwtunnel_state_get() and
lwtunnel_state_put() to lwtstate_get() and lwtstate_put().

CC: Thomas Graf <tgraf@suug.ch>
CC: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 519ec23..1109639 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1358,7 +1358,7 @@
 		list_del(&rt->rt_uncached);
 		spin_unlock_bh(&ul->lock);
 	}
-	lwtunnel_state_put(rt->rt_lwtstate);
+	lwtstate_put(rt->rt_lwtstate);
 }
 
 void rt_flush_dev(struct net_device *dev)
@@ -1407,12 +1407,7 @@
 #ifdef CONFIG_IP_ROUTE_CLASSID
 		rt->dst.tclassid = nh->nh_tclassid;
 #endif
-		if (nh->nh_lwtstate) {
-			lwtunnel_state_get(nh->nh_lwtstate);
-			rt->rt_lwtstate = nh->nh_lwtstate;
-		} else {
-			rt->rt_lwtstate = NULL;
-		}
+		rt->rt_lwtstate = lwtstate_get(nh->nh_lwtstate);
 		if (unlikely(fnhe))
 			cached = rt_bind_exception(rt, fnhe, daddr);
 		else if (!(rt->dst.flags & DST_NOCACHE))