vnet: fix format of deleted sw interfaces

As similar 535364e90459566b603661c3dbe360c72f59ad71 is
merged, printing possibly deleted interfaces by index
only in all the rest cases.

Type: improvement
Signed-off-by: Vladislav Grishenko <themiron@yandex-team.ru>
Change-Id: I4fa58b382c0279ff893523ba0188fdb9b09e10af
diff --git a/src/vnet/ip/ip_punt_drop.c b/src/vnet/ip/ip_punt_drop.c
index bf01ada..dc113f5 100644
--- a/src/vnet/ip/ip_punt_drop.c
+++ b/src/vnet/ip/ip_punt_drop.c
@@ -143,9 +143,8 @@
 
     rx = ip_punt_redirect_get (rxs[rx_sw_if_index]);
 
-    s = format (s, " rx %U via:\n",
-		format_vnet_sw_interface_name, vnm,
-		vnet_get_sw_interface (vnm, rx_sw_if_index));
+    s = format (s, " rx %U via:\n", format_vnet_sw_if_index_name, vnm,
+		rx_sw_if_index);
     s = format (s, " %U", format_fib_path_list, rx->pl, 2);
     s = format (s, " forwarding\n", format_dpo_id, &rx->dpo, 0);
     s = format (s, "  %U\n", format_dpo_id, &rx->dpo, 0);