tst_test.h: fix tst_test->tid for unsupported cases

If some cases aren't supported by system, they fail with
the following message:
  "tst_test.c:569: BROK: No tid set in test structure"
We should return TCONF instead of TBROK.

This has been broken by:

commit f5f208bc067add80da32f6e3fd9a564d3c0ded0b
Author: Cyril Hrubis <chrubis@suse.cz>
Date:   Thu Aug 4 16:10:21 2016 +0200

    tst_test: Complain on NULL test->tid

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
1 file changed