compel/include/log.h: whitespace cleanup

Those macros look twice as long as they should be on my 80-columns
terminal. As there is nothing here to justify such width, go ahead
and remove the extra tabs, keeping the code within 80 cols.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>