Remove unused variables.

Change-Id: I3b1384e78c55b7327b6a635d0a853665cbb59e8b
diff --git a/setif.c b/setif.c
index 359ed24..07f5bac 100644
--- a/setif.c
+++ b/setif.c
@@ -159,7 +159,7 @@
  * ifname    - name of interface to add the address to
  */
 int add_anycast_address(int sock, struct in6_addr *addr, const char *ifname) {
-  int ifindex, s, ret;
+  int ifindex;
 
   ifindex = if_nametoindex(ifname);
   if (!ifindex) {