NAT66:assgin a error value for clib_bihash_kv_48_8_t kv

Change-Id: Iac0c8218abc8d144d93a955e948a48a732b63107
Signed-off-by: lijianpeng <li.jianpeng@zte.com.cn>
diff --git a/src/plugins/nat/nat_reass.c b/src/plugins/nat/nat_reass.c
index d7f9d58..673acfa 100755
--- a/src/plugins/nat/nat_reass.c
+++ b/src/plugins/nat/nat_reass.c
@@ -546,8 +546,9 @@
       kv.key[0] = k.as_u64[0];
       kv.key[1] = k.as_u64[1];
       kv.key[2] = k.as_u64[2];
-      kv.key[3] = k.as_u64[4];
-      kv.key[4] = k.as_u64[5];
+      kv.key[3] = k.as_u64[3];
+      kv.key[4] = k.as_u64[4];
+      kv.key[5] = k.as_u64[5];
       if (clib_bihash_add_del_48_8 (&srm->ip6_reass_hash, &kv, 0))
 	{
 	  reass = 0;