AUDIT: Fix definition of audit_log_start() if audit not enabled

audit_log_start() seems to take 3 arguments, but its defined to take 
only 2 when AUDIT is turned off.

security/selinux/avc.c:553:75: macro "audit_log_start" passed 3 arguments, but takes just 2

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

include/linux/audit.h

@@ -286,7 +286,7 @@ extern void		    audit_log_lost(const char *message);
 extern struct semaphore audit_netlink_sem;
 #else
 #define audit_log(c,t,f,...) do { ; } while (0)
-#define audit_log_start(c,t) ({ NULL; })
+#define audit_log_start(c,g,t) ({ NULL; })
 #define audit_log_vformat(b,f,a) do { ; } while (0)
 #define audit_log_format(b,f,...) do { ; } while (0)
 #define audit_log_end(b) do { ; } while (0)