KEYS: Fix missing statics

Fix missing statics (found by checker).

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index 842e6f4..739e745 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -44,12 +44,12 @@
 	.read		= request_key_auth_read,
 };
 
-int request_key_auth_preparse(struct key_preparsed_payload *prep)
+static int request_key_auth_preparse(struct key_preparsed_payload *prep)
 {
 	return 0;
 }
 
-void request_key_auth_free_preparse(struct key_preparsed_payload *prep)
+static void request_key_auth_free_preparse(struct key_preparsed_payload *prep)
 {
 }