KEYS: key_is_dead() should take a const key pointer argument

key_is_dead() should take a const key pointer argument as it doesn't modify
what it points to.

Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/security/keys/internal.h b/security/keys/internal.h
index df971fe..490aef5 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -203,7 +203,7 @@
 /*
  * Determine whether a key is dead.
  */
-static inline bool key_is_dead(struct key *key, time_t limit)
+static inline bool key_is_dead(const struct key *key, time_t limit)
 {
 	return
 		key->flags & ((1 << KEY_FLAG_DEAD) |