[NET_SCHED]: mark classifier ops __read_mostly

Additionally remove unnecessary NULL initilizations of the next pointer.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index 471909e..e36977b 100644
--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -485,8 +485,7 @@
 	return -1;
 }
 
-static struct tcf_proto_ops cls_tcindex_ops = {
-	.next		=	NULL,
+static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
 	.kind		=	"tcindex",
 	.classify	=	tcindex_classify,
 	.init		=	tcindex_init,