SUNRPC: Hoist init_encode out of svc_authenticate()

Now that each ->accept method has been converted, the
svcxdr_init_encode() calls can be hoisted back up into the generic
RPC server code.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/auth_gss/svcauth_gss.c

@@ -1589,8 +1589,6 @@ svcauth_gss_accept(struct svc_rqst *rqstp)
 	int		ret;
 	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
 
-	svcxdr_init_encode(rqstp);
-
 	rqstp->rq_auth_stat = rpc_autherr_badcred;
 	if (!svcdata)
 		svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);

net/sunrpc/svc.c

@@ -1262,6 +1262,8 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *resv)
 		if (rqstp->rq_prog == progp->pg_prog)
 			break;
 
+	svcxdr_init_encode(rqstp);
+
 	/*
 	 * Decode auth data, and add verifier to reply buffer.
 	 * We do this before anything else in order to get a decent

net/sunrpc/svcauth_unix.c

@@ -772,7 +772,6 @@ svcauth_null_accept(struct svc_rqst *rqstp)
 	if (cred->cr_group_info == NULL)
 		return SVC_CLOSE; /* kmalloc failure - client must retry */
 
-	svcxdr_init_encode(rqstp);
 	if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
 					  RPC_AUTH_NULL, NULL, 0) < 0)
 		return SVC_CLOSE;
@@ -855,7 +854,6 @@ svcauth_tls_accept(struct svc_rqst *rqstp)
 	if (cred->cr_group_info == NULL)
 		return SVC_CLOSE;
 
-	svcxdr_init_encode(rqstp);
 	if (rqstp->rq_xprt->xpt_ops->xpo_start_tls) {
 		p = xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2 + 8);
 		if (!p)
@@ -959,7 +957,6 @@ svcauth_unix_accept(struct svc_rqst *rqstp)
 		return SVC_DENIED;
 	}
 
-	svcxdr_init_encode(rqstp);
 	if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
 					  RPC_AUTH_NULL, NULL, 0) < 0)
 		return SVC_CLOSE;