gms/gossiper: Fix compilation error

Commit 02b04e5 ("gossip: Add is_safe_for_bootstrap") needs on extra
curly bracket to compile.
Message-Id: <1452177529-13555-1-git-send-email-penberg@scylladb.com>

gms/gossiper.cc

@@ -1594,6 +1594,7 @@ future<> gossiper::wait_for_gossip_to_settle() {
             logger.info("No gossip backlog; proceeding");
         }
     });
+}
 
 bool gossiper::is_safe_for_bootstrap(inet_address endpoint) {
     auto eps = get_endpoint_state_for_endpoint(endpoint);