fix compiler warning

lib/socks.c

@@ -392,7 +392,7 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
   long timeout;
   bool socks5_resolve_local = (bool)(data->set.proxytype == CURLPROXY_SOCKS5);
   const size_t hostname_len = strlen(hostname);
-  int packetsize = 0;
+  ssize_t packetsize = 0;
 
   /* RFC1928 chapter 5 specifies max 255 chars for domain name in packet */
   if(!socks5_resolve_local && hostname_len > 255)

src/main.c

@@ -1466,7 +1466,9 @@ static int sockoptcallback(void *clientp, curl_socket_t curlfd,
   struct Configurable *config = (struct Configurable *)clientp;
   int onoff = 1; /* this callback is only used if we ask for keepalives on the
                     connection */
-  long keepidle = config->alivetime;
+#if defined(TCP_KEEPIDLE) || defined(TCP_KEEPINTVL)
+  int keepidle = (int)config->alivetime;
+#endif
 
   switch (purpose) {
   case CURLSOCKTYPE_IPCXN: