ipip: Unintialized return variable (coverity warning)

Type: fix

Change-Id: I008f23b5f0c7269ddd35cc747a867240fbe9c49b
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/ipip/ipip_api.c b/src/vnet/ipip/ipip_api.c
index 97fff15..98e3685 100644
--- a/src/vnet/ipip/ipip_api.c
+++ b/src/vnet/ipip/ipip_api.c
@@ -165,6 +165,7 @@
   u32 sixrd_tunnel_index, ip4_fib_index, ip6_fib_index;
   int rv;
 
+  sixrd_tunnel_index = ~0;
   ip4_fib_index = fib_table_find (FIB_PROTOCOL_IP4, ntohl (mp->ip4_table_id));
   ip6_fib_index = fib_table_find (FIB_PROTOCOL_IP6, ntohl (mp->ip6_table_id));