audit: make functions static

I was doing some namespace checks and found some simple stuff in
audit that could be cleaned up. Make some functions static, and
put const on make_reply payload arg.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/audit.h b/kernel/audit.h
index f7206db..91e7071 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -84,10 +84,7 @@
 				    int *dirlen);
 extern struct sk_buff *	    audit_make_reply(int pid, int seq, int type,
 					     int done, int multi,
-					     void *payload, int size);
-extern void		    audit_send_reply(int pid, int seq, int type,
-					     int done, int multi,
-					     void *payload, int size);
+					     const void *payload, int size);
 extern void		    audit_panic(const char *message);
 
 struct audit_netlink_list {