sunrpc: merge svc_rqst_alloc() into svc_prepare_thread()

The only caller of svc_rqst_alloc() is svc_prepare_thread().  So merge
the one into the other and simplify.
Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/svc.c

@@ -678,7 +678,7 @@ svc_rqst_free(struct svc_rqst *rqstp)
 }
 
 static struct svc_rqst *
-svc_rqst_alloc(struct svc_serv *serv, struct svc_pool *pool, int node)
+svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
 {
 	struct svc_rqst	*rqstp;
 
@@ -706,21 +706,6 @@ svc_rqst_alloc(struct svc_serv *serv, struct svc_pool *pool, int node)
 	if (!svc_init_buffer(rqstp, serv->sv_max_mesg, node))
 		goto out_enomem;
 
-	return rqstp;
-out_enomem:
-	svc_rqst_free(rqstp);
-	return NULL;
-}
-
-static struct svc_rqst *
-svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
-{
-	struct svc_rqst	*rqstp;
-
-	rqstp = svc_rqst_alloc(serv, pool, node);
-	if (!rqstp)
-		return ERR_PTR(-ENOMEM);
-
 	serv->sv_nrthreads += 1;
 	pool->sp_nrthreads += 1;
 
@@ -730,6 +715,10 @@ svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
 	list_add_rcu(&rqstp->rq_all, &pool->sp_all_threads);
 
 	return rqstp;
+
+out_enomem:
+	svc_rqst_free(rqstp);
+	return NULL;
 }
 
 /**
@@ -810,8 +799,8 @@ svc_start_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
 		node = svc_pool_map_get_node(chosen_pool->sp_id);
 
 		rqstp = svc_prepare_thread(serv, chosen_pool, node);
-		if (IS_ERR(rqstp))
-			return PTR_ERR(rqstp);
+		if (!rqstp)
+			return -ENOMEM;
 		task = kthread_create_on_node(serv->sv_threadfn, rqstp,
 					      node, "%s", serv->sv_name);
 		if (IS_ERR(task)) {