remove unused variables.

src/socket.c

@@ -36,8 +36,7 @@ static mrb_value
 mrb_addrinfo_getaddrinfo(mrb_state *mrb, mrb_value klass)
 {
   struct addrinfo hints, *res0, *res;
-  struct sockaddr_un sock_un;
-  mrb_value ai, ary, family, lastai, nodename, protocol, s, sa, service, socktype;
+  mrb_value ai, ary, family, lastai, nodename, protocol, sa, service, socktype;
   mrb_int flags;
   int arena_idx, error;
   const char *hostname = NULL, *servname = NULL;
@@ -45,8 +44,6 @@ mrb_addrinfo_getaddrinfo(mrb_state *mrb, mrb_value klass)
   ary = mrb_ary_new(mrb);
   arena_idx = mrb_gc_arena_save(mrb);  /* ary must be on arena! */
 
-  s = mrb_str_new(mrb, (void *)&sock_un, sizeof(sock_un));
-
   family = socktype = protocol = mrb_nil_value();
   flags = 0;
   mrb_get_args(mrb, "oo|oooi", &nodename, &service, &family, &socktype, &protocol, &flags);