poll: defalut set POLLERR POLLHUP to events

Signed-off-by: ligd <liguiding1@xiaomi.com>

fs/vfs/fs_poll.c

@@ -120,6 +120,7 @@ static inline int poll_setup(FAR struct pollfd *fds, nfds_t nfds,
       fds[i].sem     = sem;
       fds[i].revents = 0;
       fds[i].priv    = NULL;
+      fds[i].events |= POLLERR | POLLHUP;
 
       /* Check for invalid descriptors. "If the value of fd is less than 0,
        * events shall be ignored, and revents shall be set to 0 in that entry