c11 safe string handling support

Change-Id: Ied34720ca5a6e6e717eea4e86003e854031b6eab
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vnet/ip/ip4_punt_drop.c b/src/vnet/ip/ip4_punt_drop.c
index 3600d7c..ed4cbcf 100644
--- a/src/vnet/ip/ip4_punt_drop.c
+++ b/src/vnet/ip/ip4_punt_drop.c
@@ -445,7 +445,7 @@
 	;
       else if (unformat (line_input, "via %U",
 			 unformat_vnet_sw_interface, vnm, &tx_sw_if_index))
-	memset (&nh, 0, sizeof (nh));
+	clib_memset (&nh, 0, sizeof (nh));
       else
 	{
 	  error = unformat_parse_error (line_input);