vlib: split vlib_main_t into global and per-thread

Type: refactor
Change-Id: I8b273bc3bf16aa360f031f1b2692f766e5fc4613
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vlib/node.c b/src/vlib/node.c
index 9de4c69..f4329e7 100644
--- a/src/vlib/node.c
+++ b/src/vlib/node.c
@@ -572,6 +572,7 @@
 void
 vlib_register_all_static_nodes (vlib_main_t * vm)
 {
+  vlib_global_main_t *vgm = vlib_get_global_main ();
   vlib_node_registration_t *r;
 
   static char *null_node_error_strings[] = {
@@ -590,7 +591,7 @@
      real node */
   register_node (vm, &null_node_reg);
 
-  r = vm->node_main.node_registrations;
+  r = vgm->node_registrations;
   while (r)
     {
       register_node (vm, r);