fio: fix segfault on 32bits platforms

Uses wrong type in log_info().

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
log: add printf() attribute to log_*() functions

Similarly to how it's done for dprint(), so we can catch
format errors.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Fixup bad logging types

Signed-off-by: Jens Axboe <axboe@kernel.dk>