fs/vfs/fs_dup.c: before file_allocate should restore minfd if define FDCHECK

When we use fcntl for dup, an fd is directly passed. If we have opened FDCHECK. we need to restore this file descriptor.

open FDCHECK and test this：

`
int main(int ac, char **av)
{
  int fd1= open("./1.txt", O_WRONLY | O_CREAT, 0666);
  if (fd1 < 0)
    {
      printf("open err\n");
      return fd1;
  }

  int fd2= open("./2.txt", O_WRONLY | O_CREAT, 0666);
  if (fd2 < 0)
    {
      printf("open err\n");
      close(fd1);
      return fd2;
    }

  //close(fd2);
  int fd3 = fcntl(fd1, F_DUPFD, fd2);
  printf("fd3 = %d\n", fd3);
  close(fd1);
  close(fd3);
  return 0;
}
`

Signed-off-by: zhangshoukui <zhangshoukui@xiaomi.com>

fs/vfs/fs_dup.c

@@ -63,6 +63,8 @@ int file_dup(FAR struct file *filep, int minfd, int flags)
 
 #ifdef CONFIG_FDCHECK
   uint8_t f_tag_fdcheck; /* File owner fdcheck tag, init to 0 */
+
+  minfd = fdcheck_restore(minfd);
 #endif
 
   fd2 = file_allocate(g_root_inode, 0, 0, NULL, minfd, true);