SUNRPC: Get rid of the redundant xprt->shutdown bit field

It is only set after everyone has dereferenced the transport,
and serves no useful purpose: setting it is racy, so all the
socket code, etc still needs to be able to cope with the cases
where they miss reading it.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

include/linux/sunrpc/xprt.h

@@ -173,8 +173,7 @@ struct rpc_xprt {
 	unsigned int		min_reqs;	/* min number of slots */
 	atomic_t		num_reqs;	/* total slots */
 	unsigned long		state;		/* transport state */
-	unsigned char		shutdown   : 1,	/* being shut down */
-				resvport   : 1; /* use a reserved port */
+	unsigned char		resvport   : 1; /* use a reserved port */
 	unsigned int		swapper;	/* we're swapping over this
 						   transport */
 	unsigned int		bind_index;	/* bind function index */