Avoid (s)size_t for portability

ttynvt.c

@@ -62,7 +62,7 @@ typedef struct {
     struct pollfd   fds[3];
 
     char            net_buf[NET_BUF_SIZE];
-    size_t          net_cnt;
+    int             net_cnt;
     char            tmp_buf[TMP_BUF_SIZE];
 
     struct termios  tio;
@@ -191,7 +191,7 @@ static void _update_notify(ttynvt_t * tty, struct fuse_pollhandle *ph)
 static void    *_read_net(void *arg)
 {
     ttynvt_t       *tty = (ttynvt_t *) arg;
-    ssize_t         res;
+    int             res;
 
     pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
 
@@ -324,7 +324,7 @@ static int _srv_read(void *cctx, int timeout)
                        NET_BUF_SIZE - tty->net_cnt);
             if (res <= 0)
                 return res;
-            tty->net_cnt += (size_t) res;
+            tty->net_cnt += res;
             res = telnet_rx(tty->tn, tty->net_buf, &tty->net_cnt);
             if (res == 0)
                 break;
@@ -516,7 +516,7 @@ ttynvt_write(fuse_req_t req, const char *data, size_t size, off_t off,
              struct fuse_file_info *info)
 {
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
-    ssize_t         res;
+    int             res;
 
 
     if (size == 0)