fib: constify the adjacency in the rewrite nodes

Type: refactor

Signed-off-by: Neale Ranns <nranns@cisco.com>
Change-Id: I3aad20b35d89fc541fdf185096d71ca12b09a6e2
diff --git a/src/vnet/lisp-gpe/lisp_gpe_adjacency.c b/src/vnet/lisp-gpe/lisp_gpe_adjacency.c
index 4b5ca17..d9c22a4 100644
--- a/src/vnet/lisp-gpe/lisp_gpe_adjacency.c
+++ b/src/vnet/lisp-gpe/lisp_gpe_adjacency.c
@@ -206,7 +206,8 @@
 }
 
 static void
-lisp_gpe_increment_stats_counters (lisp_cp_main_t * lcm, ip_adjacency_t * adj,
+lisp_gpe_increment_stats_counters (lisp_cp_main_t * lcm,
+				   const ip_adjacency_t * adj,
 				   vlib_buffer_t * b)
 {
   lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main ();
@@ -273,7 +274,8 @@
 
 static void
 lisp_gpe_fixup (vlib_main_t * vm,
-		ip_adjacency_t * adj, vlib_buffer_t * b, const void *data)
+		const ip_adjacency_t * adj,
+		vlib_buffer_t * b, const void *data)
 {
   lisp_cp_main_t *lcm = vnet_lisp_cp_get_main ();