[PATCH] tst-ttyname: skip the test when /dev/ptmx is not available

[Florian Weimer]

* Dmitry V. Levin:

> * sysdeps/unix/sysv/linux/tst-ttyname.c (do_in_chroot_1): Skip the
> test instead of failing in case of an error returned by posix_openpt.

I think the test failure is real in this case.  I wouldn't it be?