lib/tst_test.c: mntpoint implies tmpdir

If mntpoint is set in the test structure we create a directory hence we
need to ensure that we are creating the directory in the right place.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
Tested-by: Petr Vorel <pvorel@suse.cz>
diff --git a/lib/tst_test.c b/lib/tst_test.c
index 8be1332..e254069 100644
--- a/lib/tst_test.c
+++ b/lib/tst_test.c
@@ -638,6 +638,7 @@
 {
 	return tst_test->needs_tmpdir ||
 	       tst_test->needs_device ||
+	       tst_test->mntpoint ||
 	       tst_test->resource_files ||
 	       tst_test->needs_checkpoints;
 }