netprio_cgroup: make local table static

Minor sparse warning

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index 0777d0a..7aa8850 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -247,7 +247,7 @@
 	{ }	/* terminate */
 };
 
-struct cgroup_subsys net_prio_subsys = {
+static struct cgroup_subsys net_prio_subsys = {
 	.name		= "net_prio",
 	.css_alloc	= cgrp_css_alloc,
 	.css_online	= cgrp_css_online,