cnat: Fix unformat_cnat_snat_interface_map_type

Fix initialization of the table u32 var which is leading to the incorrect
unformat of interface map type

Type: fix

Signed-off-by: Miguel Borges de Freitas <miguel-r-freitas@alticelabs.com>
Change-Id: I1e56acd0e4c735df755e85b172bb6623bf47a57b
diff --git a/src/plugins/cnat/cnat_snat_policy.c b/src/plugins/cnat/cnat_snat_policy.c
index d59156f..298dc76 100644
--- a/src/plugins/cnat/cnat_snat_policy.c
+++ b/src/plugins/cnat/cnat_snat_policy.c
@@ -108,7 +108,7 @@
   vnet_main_t *vnm = vnet_get_main ();
   int is_add = 1;
   u32 sw_if_index = ~0;
-  u32 table;
+  u32 table = 0;
   int rv;
 
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)