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/fib_semantics.c b/net/ipv4/fib_semantics.c
index d4c6732..65e0039 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -209,7 +209,7 @@
 	change_nexthops(fi) {
 		if (nexthop_nh->nh_dev)
 			dev_put(nexthop_nh->nh_dev);
-		lwtunnel_state_put(nexthop_nh->nh_lwtstate);
+		lwtstate_put(nexthop_nh->nh_lwtstate);
 		free_nh_exceptions(nexthop_nh);
 		rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output);
 		rt_fibinfo_free(&nexthop_nh->nh_rth_input);
@@ -514,8 +514,8 @@
 							   nla, &lwtstate);
 				if (ret)
 					goto errout;
-				lwtunnel_state_get(lwtstate);
-				nexthop_nh->nh_lwtstate = lwtstate;
+				nexthop_nh->nh_lwtstate =
+					lwtstate_get(lwtstate);
 			}
 		}
 
@@ -971,8 +971,7 @@
 			if (err)
 				goto failure;
 
-			lwtunnel_state_get(lwtstate);
-			nh->nh_lwtstate = lwtstate;
+			nh->nh_lwtstate = lwtstate_get(lwtstate);
 		}
 		nh->nh_oif = cfg->fc_oif;
 		nh->nh_gw = cfg->fc_gw;