Fix uninitialized variables

src/local.c

@@ -369,7 +369,7 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
                     ev_io_start(EV_A_ & remote->send_ctx->io);
                     ev_timer_start(EV_A_ & remote->send_ctx->watcher);
                 } else {
-                    int s;
+                    int s = -1;
 #if defined(MSG_FASTOPEN) && !defined(TCP_FASTOPEN_CONNECT)
                     s = sendto(remote->fd, remote->buf->data, remote->buf->len, MSG_FASTOPEN,
                                    (struct sockaddr *)&(remote->addr), remote->addr_len);

src/redir.c

@@ -552,10 +552,9 @@ remote_send_cb(EV_P_ ev_io *w, int revents)
         return;
     } else {
         // has data to send
-        int s;
+        int s = -1;
 
         if (remote->addr != NULL) {
-
 #if defined(TCP_FASTOPEN_CONNECT)
             int optval = 1;
             if(setsockopt(remote->fd, IPPROTO_TCP, TCP_FASTOPEN_CONNECT,

src/server.c

@@ -507,8 +507,7 @@ connect_to_remote(EV_P_ struct addrinfo *res,
     remote_t *remote = new_remote(sockfd);
 
     if (fast_open) {
-
-        int s;
+        int s = -1;
 #if defined(MSG_FASTOPEN) && !defined(TCP_FASTOPEN_CONNECT)
         s = sendto(sockfd, server->buf->data, server->buf->len,
                 MSG_FASTOPEN, res->ai_addr, res->ai_addrlen);