netns: build fix for net_alloc_generic

net_alloc_generic was defined in #ifdef CONFIG_NET_NS, but used
unconditionally. Move net_alloc_generic out of #ifdef.
Signed-off-by: Clemens Noss <cnoss@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/net_namespace.c

@@ -63,10 +63,6 @@ static __net_init int setup_net(struct net *net)
 	goto out;
 }
 
-#ifdef CONFIG_NET_NS
-static struct kmem_cache *net_cachep;
-static struct workqueue_struct *netns_wq;
-
 static struct net_generic *net_alloc_generic(void)
 {
 	struct net_generic *ng;
@@ -80,6 +76,10 @@ static struct net_generic *net_alloc_generic(void)
 	return ng;
 }
 
+#ifdef CONFIG_NET_NS
+static struct kmem_cache *net_cachep;
+static struct workqueue_struct *netns_wq;
+
 static struct net *net_alloc(void)
 {
 	struct net *net = NULL;