Fix warnings in MAP-T code

Change-Id: If211b8b53b462d971eb683305921418224d635e8
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/vnet/vnet/map/ip4_map_t.c b/vnet/vnet/map/ip4_map_t.c
index 07f5b19..7a72068 100644
--- a/vnet/vnet/map/ip4_map_t.c
+++ b/vnet/vnet/map/ip4_map_t.c
@@ -847,7 +847,7 @@
       vlib_buffer_t *p0, *p1;
       ip4_header_t *ip40, *ip41;
       map_domain_t *d0, *d1;
-      ip4_mapt_next_t next0, next1;
+      ip4_mapt_next_t next0 = 0, next1 = 0;
       u16 ip4_len0, ip4_len1;
       u8 error0, error1;
       i32 dst_port0, dst_port1;