bgpd: Remove extra lock on interior table node

If the radix tree creates an extra interior node in bgp_node_get(),
it locks the interior node even though this node is not returned to
the caller, so it may never be unlocked. The lock prevents this node
from being deleted.

* bgpd/bgp_table.c: (bgp_node_get) Remove lock on interior node which
  prevents proper node deletion
diff --git a/bgpd/bgp_table.c b/bgpd/bgp_table.c
index 91cab60..a249c23 100644
--- a/bgpd/bgp_table.c
+++ b/bgpd/bgp_table.c
@@ -350,7 +350,6 @@
       if (new->p.prefixlen != p->prefixlen)
 	{
 	  match = new;
-	  bgp_lock_node (match);
 	  new = bgp_node_set (table, p);
 	  set_link (match, new);
 	  table->count++;