xfrm: Mark flowi arg to security_xfrm_state_pol_flow_match() const.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index fff78d3..c43ab54 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -112,7 +112,7 @@
  */
 
 int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x, struct xfrm_policy *xp,
-			struct flowi *fl)
+			const struct flowi *fl)
 {
 	u32 state_sid;
 	int rc;