lib: add igt_vlog to print varargs

... and put it to immediate use in igt_display_log.

To make this all add up also drop the return value of igt_display_log,
no one really cared anyway.

Aside: I've noticed that every time another subtest runs (at least
with kms_pipe_crc_basic) the log indent level moves one up ...

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

0 files changed, 0 insertions, 0 deletions