xfrm: constify xfrm_replay structures

The xfrm_replay structures are never modified, so declare them as const.

Done with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c
index 4fd725a..cdc2e2e7 100644
--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -558,7 +558,7 @@
 		x->repl->notify(x, XFRM_REPLAY_UPDATE);
 }
 
-static struct xfrm_replay xfrm_replay_legacy = {
+static const struct xfrm_replay xfrm_replay_legacy = {
 	.advance	= xfrm_replay_advance,
 	.check		= xfrm_replay_check,
 	.recheck	= xfrm_replay_check,
@@ -566,7 +566,7 @@
 	.overflow	= xfrm_replay_overflow,
 };
 
-static struct xfrm_replay xfrm_replay_bmp = {
+static const struct xfrm_replay xfrm_replay_bmp = {
 	.advance	= xfrm_replay_advance_bmp,
 	.check		= xfrm_replay_check_bmp,
 	.recheck	= xfrm_replay_check_bmp,
@@ -574,7 +574,7 @@
 	.overflow	= xfrm_replay_overflow_bmp,
 };
 
-static struct xfrm_replay xfrm_replay_esn = {
+static const struct xfrm_replay xfrm_replay_esn = {
 	.advance	= xfrm_replay_advance_esn,
 	.check		= xfrm_replay_check_esn,
 	.recheck	= xfrm_replay_recheck_esn,