interface: free the output_node_thread_runtimes

Type: fix

output_node_thread_runtimes was not freed when an interface
is deleted. This patch fixes it.

Change-Id: I763b0109be1904d43839528a346f3b9aa8927205
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
diff --git a/src/vnet/interface.c b/src/vnet/interface.c
index 7b5d4d6..ad6d9cc 100644
--- a/src/vnet/interface.c
+++ b/src/vnet/interface.c
@@ -1113,6 +1113,7 @@
   hash_unset_mem (im->hw_interface_by_name, hw->name);
   vec_free (hw->name);
   vec_free (hw->hw_address);
+  vec_free (hw->output_node_thread_runtimes);
   pool_put (im->hw_interfaces, hw);
 }