Remove duplicate ip6 get interface address code

Change-Id: I5e0057b36bc4221e688a27fc1c0f602f78132991
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/ip/ip6.h b/src/vnet/ip/ip6.h
index 1844d72..5456f0f 100644
--- a/src/vnet/ip/ip6.h
+++ b/src/vnet/ip/ip6.h
@@ -332,6 +332,11 @@
 					     u32 address_length, u32 is_del);
 void ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable);
 
+/**
+ * @brie get first IPv6 interface address
+ */
+ip6_address_t *ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index);
+
 int ip6_address_compare (ip6_address_t * a1, ip6_address_t * a2);
 
 clib_error_t *ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst,