[PATCH] RPC: remove bogus atomic_dec in auth_null

The atomic_dec in nul_destroy() is harmless, but can trigger an underflow
error if the atomic_dec_and_test() debugging is turned on.

Problem diagnosed by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

net/sunrpc/auth_null.c

@@ -31,7 +31,6 @@ nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
 static void
 nul_destroy(struct rpc_auth *auth)
 {
-	atomic_dec(&null_auth.au_count);
 }
 
 /*